Chloramine is a compound of chlorine and ammonia used by many municipal water systems as a more stable disinfectant than chlorine alone. Because it’s harder to remove and toxic to aquatic life, source water needs proper filtration before it’s used in a reef tank.

Bicarbonate is one of the two key ions, along with carbonate, that make up a reef aquarium’s alkalinity. Together they help buffer pH and supply the raw material corals use to build their calcium carbonate skeletons.

A cleanup crew is a group of snails, hermit crabs, and other grazing invertebrates added to a reef tank to consume algae, detritus, and leftover food. They play a hands-on role in nutrient control, working alongside filtration to help keep the tank clean.

Tissue growth refers to the expansion of a coral’s living soft tissue, distinct from but closely related to skeletal growth beneath it. It reflects overall coral nutrition, health, and favorable environmental conditions over time.

Bioavailable nutrition refers to coral foods and supplements formulated for direct, efficient absorption, minimizing the need for digestion or processing. These highly accessible nutrients, like amino acids and dissolved proteins, help support fast, effective uptake for corals and other reef organisms.

Reef nutrition refers to the broad practice of meeting the dietary needs of corals, fish, and invertebrates through appropriate feeding and supplementation. It’s foundational to coral growth, coloration, and overall tank health, alongside stable water chemistry.

ORP, or oxidation reduction potential, measures the overall oxidizing or reducing capacity of aquarium water, reflecting its ability to break down organic contaminants. It’s a useful indicator of overall water quality and stability.

Element consumption refers to the rate at which corals and other organisms draw a specific trace or major element from the water. Understanding consumption for key elements helps reef keepers dose accurately rather than relying on generic guidelines.

Chromium is a trace element present in natural seawater at very low concentrations. Like several other trace elements, its precise biological role in coral health isn’t fully understood, but it’s tracked through ICP testing as part of a tank’s overall mineral profile.

Live sand is aquarium sand that comes populated with beneficial bacteria and microfauna, offering an immediate biological boost similar to live rock. It’s commonly used to help jump-start a new tank’s nitrogen cycle.

Test kits are chemical reagent-based products used to measure specific water parameters like calcium, alkalinity, and nitrate in a reef tank. They form the foundation of informed dosing and troubleshooting decisions for every reef keeper.

Reef maturity refers to how long a tank’s ecosystem has had to stabilize and develop, including its bacterial colonies, microfauna, and overall biological balance. More mature tanks generally handle changes and stress more gracefully.

Organic waste removal refers to physically extracting uneaten food, detritus, and other organic debris from a reef tank before it fully breaks down. It’s a foundational, preventive strategy for overall nutrient control in any well-maintained reef tank.

Element replenishment refers to the process of restoring a trace or major element’s concentration to its natural or target range, typically through dosing, water changes, or automated equipment. Keeping replenishment matched to consumption is key to stable, healthy water chemistry.

PAR, or photosynthetically active radiation, measures the specific light wavelengths corals and other photosynthetic organisms actually use for photosynthesis. It’s a key metric for matching lighting intensity to a coral’s specific needs, rather than relying on wattage or brightness alone.

A reference solution is a liquid with a precisely known parameter value, used to calibrate test kits, meters, and other measuring equipment. It ensures testing results remain accurate and trustworthy over time, catching equipment drift before it affects dosing.

CO2 accumulation refers to a buildup of dissolved carbon dioxide in aquarium water or the surrounding air, which can suppress pH even when alkalinity is otherwise stable. It’s a common, often overlooked cause of persistently low pH in an indoor reef tank.

Major elements are the seawater components present in relatively large concentrations, such as calcium, magnesium, and sulfate, that form the backbone of reef tank water chemistry. They typically require the most consistent monitoring and dosing attention.

Trace element dosing refers to deliberately supplementing minor and trace elements that a reef tank’s biological consumption has depleted faster than water changes can restore. It’s typically guided by ICP testing rather than routine assumption.

Reef supplements are products designed to replenish specific elements or compounds a reef tank’s inhabitants consume, from major parameters like calcium to trace elements and nutritional additives. They support ongoing tank health by replacing what natural consumption steadily depletes over time.