A calcium reactor is a piece of equipment that dissolves calcium carbonate media using CO2-acidified water, continuously replenishing calcium and alkalinity in a reef tank. It’s a popular automated alternative to manual dosing for heavily stocked or coral-dense systems.

Adsorption is the process by which molecules or ions bind to the surface of a solid material rather than being absorbed into it. In reef aquariums, this principle drives filtration media like activated carbon and GFO, which pull dissolved organics and phosphate out of the water.

Calcium carbonate is the compound corals and other reef organisms form when they combine calcium and carbonate ions from the water. It’s the primary structural material behind coral skeletons, reef sand, and live rock, making it central to nearly every reef building process.

Activated carbon is a porous filtration media used to remove dissolved organic compounds, toxins, and discoloration from aquarium water. By binding unwanted molecules to its surface, it helps keep water clear, controls odors, and supports overall water quality in a reef system.

Acclimation is the process of gradually adjusting a new fish, coral, or invertebrate to your tank’s water conditions before introducing it to the display. Slowly matching temperature, salinity, and chemistry reduces stress and shock, giving new arrivals a much better chance of settling in successfully.

Absorption is the process by which one substance is taken up into the internal structure of another, rather than simply sticking to its surface. In a reef aquarium, this happens when gases dissolve into water or when compounds are drawn into the pores of live rock, sand, or coral tissue.

A nitrate remover is any product or method specifically designed to reduce nitrate concentration in aquarium water, ranging from specialized filtration media to biological denitrification approaches. It’s a key tool for ongoing nutrient control.

An anemone is a soft-bodied marine invertebrate closely related to corals, known for its stinging tentacles and, in many species, a well-known symbiotic relationship with clownfish. Like corals, many anemones host zooxanthellae for energy, but they require their own specific care considerations in a reef tank.

Carbon dosing is the practice of adding a liquid carbon source to feed bacteria that consume excess nitrate and phosphate in a reef tank. It’s a widely used nutrient export method that works on the same principle as biopellets, just delivered in liquid form.

Daily demand refers to the amount of a nutrient, food, or dosed supplement a reef tank’s organisms use up over a 24-hour period. Understanding daily demand helps reef keepers calibrate dosing and feeding routines to match actual, ongoing consumption.

Ammonia is a toxic nitrogen compound produced by fish waste, uneaten food, and decaying organic matter. As the first stage of the nitrogen cycle, even small amounts of ammonia can stress or harm fish and invertebrates, making it one of the most closely monitored parameters in a new aquarium.

A calibration solution is a reference liquid with a precisely known value, used to verify and adjust the accuracy of test equipment like refractometers, pH probes, and conductivity meters. Regular calibration helps ensure the readings a reef keeper relies on are actually correct.

Green hair algae is a common nuisance algae that forms thin, hair-like strands across rock and substrate, typically driven by excess nutrients. It’s persistent but generally manageable through nutrient control and manual removal.

Alkalinity consumption refers to the rate at which corals and other calcifying organisms use up alkalinity as they build their skeletons. Because this steady drawdown pulls alkalinity out of the water over time, tracking consumption helps reef keepers know how much to dose or supplement to keep levels stable.

Cyanobacteria, often called cyano, is a photosynthetic bacteria that forms slimy red, green, or dark mats across rock and sand in a reef tank. It typically signals excess nutrients or poor flow, and can spread quickly if left unaddressed.

Calcium uptake refers to the rate at which corals and other calcifying organisms draw calcium from the water to build their skeletons. Like alkalinity consumption, tracking calcium uptake helps reef keepers understand how much supplementation a tank actually needs.

Curing is the process of allowing newly acquired live rock or sand to stabilize before adding it to a display tank, letting any dying organic matter decompose safely elsewhere. It helps prevent ammonia spikes and other water quality problems in the main system.

An algae bloom is a rapid, often sudden overgrowth of algae in an aquarium, usually triggered by excess nutrients, light, or a lack of competition from other organisms. While a normal part of a young or shifting reef system, persistent blooms usually signal an imbalance that needs to be addressed.

The carbonate system describes the interconnected balance of dissolved CO2, bicarbonate, and carbonate in reef aquarium water. This equilibrium governs both pH and alkalinity, making it one of the most fundamental chemical frameworks underlying reef water chemistry.

Nitrogen is an essential element that cycles through a reef tank in various forms, from toxic ammonia to comparatively stable nitrate. Understanding nitrogen’s journey through the tank is foundational to managing water quality effectively.