Acropora is a genus of SPS coral known for its branching growth forms, vibrant coloration, and fast growth potential. Often considered the pinnacle of reef keeping, Acropora corals rely on stable water chemistry, strong lighting, proper nutrition, and consistent conditions to thrive.

Alkalinity is a measure of the water's ability to resist changes in pH and is one of the most important parameters in a reef aquarium. Corals use alkalinity as a key building block for skeletal growth, making it essential for coral health, stability, and long-term success.

Amino acids are the building blocks of proteins and play an important role in coral growth, tissue repair, coloration, and overall health. Corals obtain amino acids through feeding and direct absorption from the water, making them a key component of reef nutrition.

Bioavailability refers to how easily a coral can absorb and utilize a nutrient after it enters the aquarium. A nutrient may be present in the water or food, but if the coral cannot efficiently use it, its bioavailability is low.

Broadcast feeding is a coral feeding method where food is dispersed throughout the aquarium water column, allowing corals and other filter-feeding organisms to capture nutrients naturally. This approach closely mimics how food is delivered on natural reefs.

Calcium is one of the most important elements in a reef aquarium and serves as a primary building block for coral skeletons. Corals continuously consume calcium as they grow, making it essential for skeletal development, coral health, and long-term reef success.

Carbohydrates are organic compounds that provide a readily available source of energy for living organisms. In reef aquariums, carbohydrates contribute to coral nutrition by supporting metabolic processes, growth, and overall biological function

Copepods are tiny crustaceans that serve as an important food source for corals, fish, and other reef inhabitants. As a natural component of marine ecosystems, copepods help transfer nutrients through the food chain and contribute to overall reef health.

Coral coloration refers to the pigments, fluorescent proteins, and symbiotic algae that give corals their unique colors. Healthy coloration is influenced by lighting, nutrition, water chemistry, genetics, and overall coral health.

Coral feeding is the process of providing corals with food and nutrients beyond what they receive from photosynthesis. Through feeding, corals obtain proteins, amino acids, fatty acids, vitamins, and other essential nutrients that support growth, coloration, and overall health.  

Coral food refers to any natural or prepared nutritional source that provides corals with the proteins, amino acids, fatty acids, vitamins, and other nutrients needed for growth, coloration, tissue repair, and overall health.  

Coral growth is the process by which corals expand their tissue, build new skeleton, and increase in size over time. Healthy coral growth is influenced by a combination of lighting, nutrition, water chemistry, stability, and overall reef conditions.  

Coral health refers to the overall condition and well-being of a coral, including its growth, coloration, tissue quality, feeding activity, and ability to withstand environmental stress. Healthy corals are better equipped to grow, reproduce, and thrive within a reef aquarium.  

Coral metabolism is the collection of biological processes that allow corals to produce energy, utilize nutrients, grow, repair tissue, and maintain overall health. Every aspect of coral life—from feeding and photosynthesis to growth and reproduction—is driven by metabolism.

Coral nutrition is the process by which corals obtain and utilize energy and nutrients needed for growth, coloration, tissue repair, reproduction, and overall health. Healthy corals rely on a combination of photosynthesis, feeding, and nutrient absorption to meet their nutritional needs.

A coral polyp is the living animal portion of a coral colony. Polyps are responsible for feeding, growth, reproduction, and building the coral skeleton, making them the foundation of every coral found on a reef.

Coral tissue is the living layer of a coral that covers its skeleton and contains the cells responsible for feeding, growth, nutrient absorption, and overall health. Healthy tissue is essential for coral survival and is often one of the clearest indicators of a coral's condition.

Dissolved organics are organic compounds suspended in aquarium water that originate from food, waste, coral mucus, bacteria, and other biological processes. These compounds play an important role in nutrient cycling and can serve as a source of nutrition for corals and other reef organisms.  

Dry rock is aquarium rock that contains little to no living marine organisms when introduced into a reef system. It serves as the structural foundation of the aquarium and gradually becomes colonized by beneficial bacteria, algae, and microorganisms as the reef matures.  

Fatty acids are essential organic compounds that provide energy, support cell function, and contribute to coral growth, coloration, and overall health. They are a key component of coral nutrition and are primarily obtained through feeding.

Feeding frequency refers to how often corals are provided with food or nutritional supplementation. Finding the right feeding frequency helps balance coral growth, coloration, and health while maintaining stable water quality within the aquarium.

A feeding response is the visible reaction a coral displays when it detects food or nutrients in the water. Common feeding responses include polyp extension, tentacle expansion, mucus production, and increased activity as the coral prepares to capture and consume food.  

Flow rate refers to the volume and movement of water within a reef aquarium over a given period of time. Proper flow helps deliver oxygen and nutrients to corals, remove waste products, support feeding, and maintain overall reef health.

Goniopora, often called Flowerpot Coral, is an LPS coral known for its long flowing polyps and flower-like appearance. Once considered difficult to keep, modern understanding of coral nutrition and water chemistry has made Goniopora a popular and rewarding coral for many reef keepers.

Heterotrophic feeding is the process by which corals obtain nutrients by capturing and consuming food from their environment. Unlike photosynthesis, which provides energy through symbiotic algae, heterotrophic feeding supplies corals with proteins, amino acids, fatty acids, vitamins, and other nutrients needed for growth and health.

LPS corals, or Large Polyp Stony corals, are reef-building corals known for their large fleshy polyps, visible feeding responses, and calcium carbonate skeletons. Many LPS corals readily accept supplemental feeding and are popular for their movement, coloration, and impressive growth forms.

Live rock is porous rock that contains beneficial bacteria, microorganisms, algae, and other forms of marine life. It serves as a biological filtration system, supports biodiversity, and provides habitat for countless organisms that contribute to the health and stability of a reef aquarium.

Magnesium is a major element in seawater that helps maintain the balance between calcium and alkalinity while supporting numerous biological processes within a reef aquarium. Proper magnesium levels contribute to water chemistry stability, coral growth, and overall reef health.  

Marine proteins are proteins derived from ocean-based organisms such as fish, crustaceans, plankton, and other marine life. They provide corals with highly digestible nutrition that closely resembles the food sources available on natural reefs.  

Nitrate is a nitrogen-based nutrient that forms as part of the aquarium's biological filtration process. While corals and other reef organisms can utilize nitrate in small amounts, excessive levels may contribute to algae growth and reduced water quality, making proper nutrient balance important.

Nutrient balance is the relationship between the nutrients entering a reef aquarium and the nutrients being consumed, processed, or removed. Maintaining proper nutrient balance helps support coral growth, coloration, and overall reef health while preventing excessive nutrient accumulation.

Nutrient export is the process of removing excess nutrients and waste from a reef aquarium. Effective nutrient export helps maintain water quality, supports coral health, and prevents the accumulation of nitrate, phosphate, and other compounds that can negatively impact the reef ecosystem.

Phosphate is a phosphorus-based nutrient found in all reef aquariums and is essential for many biological processes, including energy transfer, cell function, and growth. While corals and other reef organisms require phosphate in small amounts, excessive levels can contribute to algae growth and reduced reef stability.

Photosynthesis is the process by which the symbiotic algae living within coral tissues convert light into energy. This relationship provides corals with a significant portion of the energy they need for growth, metabolism, and overall health.

Phytoplankton are microscopic photosynthetic organisms that form the foundation of many marine food webs. In reef aquariums, phytoplankton serves as a valuable food source for filter feeders, zooplankton, and other organisms that contribute to a healthy reef ecosystem.

Plankton is a general term used to describe organisms that drift through the water column and cannot actively swim against currents. In reef ecosystems, plankton serves as a major food source for corals, fish, and countless other marine organisms.

Polyp extension is the visible expansion of a coral's polyps and feeding tentacles. Reef keepers often use polyp extension as an indicator of coral activity, comfort, and feeding behavior, although it should not be viewed as the sole measure of coral health.

Potassium is an essential major element found in natural seawater that supports cellular function, nutrient transport, and overall coral health. It plays an important role in coral coloration, metabolism, and biological processes throughout the reef aquarium.

A protein skimmer is a filtration device that removes dissolved organic compounds and waste from aquarium water before they break down into nutrients such as nitrate and phosphate. Protein skimmers help improve water quality, increase oxygenation, and support overall reef stability.

Proteins are complex molecules made from amino acids that support coral growth, tissue development, repair, and essential biological functions. They are one of the most important nutritional components corals obtain through feeding.

A refugium is a separate area of a reef aquarium system designed to support beneficial organisms, nutrient export, and ecosystem stability. Commonly used to grow macroalgae and cultivate copepods, a refugium helps improve water quality while creating a more natural reef environment.

SPS corals, or Small Polyp Stony corals, are reef-building corals known for their small polyps, rigid calcium carbonate skeletons, and often vibrant coloration. They are highly sought after by reef keepers for their growth forms, colors, and ability to create stunning reef displays.

Soft corals are corals that lack the large rigid calcium carbonate skeletons found in SPS and LPS corals. Known for their movement, vibrant colors, and adaptability, soft corals obtain energy through both photosynthesis and feeding while adding motion and diversity to reef aquariums.

Symbiosis is a close relationship between two different organisms that live and function together. In reef aquariums, the most important example is the partnership between corals and zooxanthellae, where both organisms benefit from working together.

Target feeding is a coral feeding method where food is delivered directly to a specific coral using a feeding tool such as a pipette, turkey baster, or syringe. This approach allows reef keepers to provide nutrition precisely where it is needed while minimizing food distribution throughout the aquarium.

Torch corals are popular LPS corals known for their long flowing tentacles, vibrant colors, and dramatic movement in the aquarium. Through a combination of photosynthesis and feeding, torch corals obtain the energy and nutrients needed for growth, coloration, and overall health.

Trace elements are minerals that corals and other reef inhabitants require in very small amounts to support growth, coloration, metabolism, and overall health. Although needed in tiny quantities, these elements play essential roles in many biological processes within a reef aquarium.

Vitamins are essential organic compounds that support coral health, growth, metabolism, and overall biological function. Although required in small amounts, vitamins play a critical role in helping corals maintain normal cellular processes and respond to environmental stress.  

Zooplankton are microscopic animals that drift through the water column and serve as one of the most important natural food sources for corals and many other reef inhabitants. Rich in proteins, amino acids, fatty acids, and other nutrients, zooplankton plays a vital role in reef nutrition.  

Zooxanthellae are microscopic algae that live within the tissues of many reef-building corals. Through photosynthesis, these algae produce energy that helps support coral growth, metabolism, coloration, and overall health.