Montipora is a diverse genus of SPS coral known for its wide range of growth forms, from encrusting plates to branching structures. It’s popular among reef keepers for its relative hardiness and striking color variety.

A skimmer cup is the removable collection container atop a protein skimmer that captures concentrated organic waste, or skimmate, as it overflows from the reaction chamber. Regular cup emptying is a routine but essential maintenance task.

A coral feeding schedule is a planned routine for how often and how much food a reef tank’s corals receive. Establishing a consistent schedule helps match nutrition to actual demand, supporting healthy growth without overloading the system with excess nutrients.

Molybdenum is a trace element involved in certain enzymatic processes within reef organisms, present naturally in seawater at very low concentrations. It’s rarely tested or dosed directly, typically appearing only on comprehensive ICP reports.

Coral bleaching is the process by which corals expel their symbiotic algae, causing them to turn white or pale. It’s typically triggered by stress from temperature swings, light changes, or poor water quality, and can be fatal if the coral doesn’t recover its algae in time.

Molecular binding refers to the chemical attraction between molecules or ions, a concept underlying processes like chelation, adsorption, and filtration media function. It helps explain how various reef tank chemistry and equipment interactions occur.

Two-part dosing is a widely used method of supplementing calcium and alkalinity through two separate liquid solutions, dosed daily to replenish what coral calcification consumes. It’s one of the most accessible ways to maintain stable major elements.

A cryptic zone is a dark, low-flow area of a reef tank, often within a sump or beneath rockwork, where light-avoiding filter feeders and microfauna thrive. It adds biodiversity and supports natural nutrient processing beyond what the display tank alone provides.

Natural seawater is ocean water collected directly from the sea, sometimes used in reef keeping as an alternative to synthetic salt mix. It offers a complex natural composition but requires careful sourcing to avoid contamination risks.

Coralline algae is a calcifying algae that grows as a hard, encrusting layer across rock, glass, and other surfaces in a reef tank. Its pink, purple, and red coloration is widely considered a sign of a healthy, well-established system.

Euphyllia is a genus of large-polyp stony coral known for its long, fleshy tentacles and vivid coloration, encompassing popular types like Torch, Hammer, and Frogspawn corals. Despite its stony skeleton, its soft, waving appearance and potent sting mean careful placement is essential.

Pelagic feeding refers to consuming food particles suspended in the open water column, rather than from the substrate or rock surfaces. It’s the natural feeding strategy of many reef fish and filter-feeding invertebrates.

Vanadium is a trace element present in natural seawater at very low concentrations, with a role in reef tank biology that remains poorly understood. It’s rarely tested or dosed directly, typically appearing only on comprehensive ICP reports.

Equilibrium refers to a stable balance point in a reef tank’s water chemistry, where opposing chemical processes offset each other and parameters remain relatively steady. Understanding equilibrium helps explain why interconnected parameters like pH and alkalinity behave the way they do.

A PAR meter is a specialized handheld device used to measure photosynthetically active radiation at specific points within a reef tank. It helps reef keepers match lighting intensity to each coral’s actual needs.

A UV sterilizer is equipment that uses ultraviolet light to neutralize free-floating pathogens, algae spores, and parasites as water passes through it. It’s a popular tool for reducing disease outbreaks and controlling water clarity.

Elemental demand refers to the overall need a reef tank’s organisms have for various trace and major elements to support growth, coloration, and metabolic function. Understanding elemental demand helps guide a more complete, well-rounded supplementation strategy.

Nickel is a trace element present in natural seawater at very low concentrations, with a role in reef tank biology that remains poorly understood. It’s rarely tested or dosed directly, typically appearing only on comprehensive ICP reports.

An Ultra Low Nutrient System, or ULNS, is a reef keeping approach that deliberately maintains very low nitrate and phosphate levels, typically to support vivid SPS coral coloration. It requires aggressive, carefully managed nutrient export.

Element toxicity occurs when a trace or major element’s concentration rises high enough to harm corals, fish, or invertebrates. It typically results from over-dosing, contamination, or gradual accumulation over time, making careful, measured supplementation an essential habit for every reef keeper.