F

FILAMENTOUS ALGAE

Small, thread-like species that is much more efficient at nutrient uptake than mature colonies.

FILTER

A device which removes particulate and chemical impurities from, and circulates aquarium water. Typical categories are Biological, Chemical, or Mechanical.

FILTER MEDIA

Various materials used in a Filter which remove particles and impurities from the water by mechanical, biological, and/or chemical means.

FIN ROT

A condition in which the fins are rotted away giving the appearance of ragged, split, or perforated fins.

FISH HAVER

One who has fish in home aquaria, without purposeful consideration for the fish's health or wellbeing.

FISH KEEPER

One who has fish in home aquaria, and tries to maintain optimum conditions for the fish.

FISH ONLY (FO)

Saltwater aquarium containing fish but not Live Rock or Reef animals.

FISH ONLY WITH LIVE ROCK (FOWLR)

A saltwater aquarium that contains only fish and Live Rock.

FISHLESS CYCLE

To Cycle an aquatic system without live fish, using chemical or household ammonia, or decaying material such as fish food or a piece of shrimp to promote the establishment of nitrifying bacteria (as Biofilm).

FLARING

Spreading out the gills and fins as a form of Display. The Betta splendens is known for his display of flaring.

FLUORESCENT LIGHTING

A relatively cool, energy-efficient artificial light source. Produced by gas discharge (ionization) in a low-pressure tube. The recommended and most common type of lighting used for aquaria. Compare Incandescent.

FOUNDATION ROCK

Base rock (preferred) or dead rock flat on two sides, used to support the rock work. This is the "blueprint" for a coral reef.   Without it, the reef structure is doomed to collapse, as the sand bed dissolves.

FRESHWATER (FW)

FRY

Fish larvae

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