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.

New tank syndrome refers to the wave of ammonia and nitrite spikes a newly set up aquarium experiences before its beneficial bacteria colony fully establishes. It’s a normal part of cycling, but can be harmful if livestock is added too soon.

Precipitation, in reef tank chemistry, refers to dissolved compounds like calcium carbonate coming out of solution and forming solid particles. Understanding it explains why imbalanced dosing can cause cloudy water or wasted supplements.

Water stability refers to how consistently a reef tank’s key parameters stay within their appropriate ranges over time, avoiding sharp swings. It’s widely considered more important to coral health than hitting any single perfect number.

A frag plug is a small ceramic or resin base used to mount coral fragments while they heal and grow before being placed permanently in a display tank. Its flat bottom makes it easy to arrange, sell, or trade coral frags.

Phosphorus is an essential element that exists in aquarium water primarily as phosphate, playing a role in both coral biology and nuisance algae growth. Understanding phosphorus helps clarify the broader phosphate management conversation.

Fluoride is a trace element present in natural seawater that plays a minor role in certain biological processes for reef organisms. It’s rarely a focus of routine testing or dosing, since deficiencies and excesses are both relatively uncommon in home aquariums.

A phosphate remover is any product or method specifically designed to reduce phosphate concentration in aquarium water, most commonly iron-based filtration media like GFO. It’s a key targeted tool for nuisance algae control.

pH stability refers to keeping a reef tank’s pH consistent over time, minimizing dramatic swings that can stress corals and other sensitive livestock. Natural daily fluctuation is normal, but large or abrupt swings are not.

Water parameters refer to the collective set of measurable values, such as salinity, temperature, pH, alkalinity, calcium, and nutrients, that define a reef tank’s chemical and physical environment. Monitoring them is central to successful reef keeping.

Filter socks are mesh fabric bags used in a sump to mechanically trap detritus and debris before water continues through the filtration system. Regular rinsing or replacement keeps them from becoming a source of nutrients themselves.

pH measures how acidic or basic aquarium water is, playing a critical role in coral health, the carbonate system, and overall biological function. Reef tanks generally target a pH range that mirrors natural seawater.