HARD WATER
Water which has a high concentration of dissolved minerals and solids.
HERBIVORE
One that eats mainly or only vegetable foods.
HOLE IN THE HEAD DISEASE (HITH)
HIGH OUTPUT (HO) FLUORESCENT LIGHTING
HANG ON BACK (HOB)
aka Hang on Tank (HOT) Equipment which hangs on the rim of an aquarium.
HOSPITAL TANK
A separate tank in which sick fish can be isolated from the main tank population while undergoing treatment. See Quarantine Tank.
HQI
Mercury (Hg) Quartz Iodide, a type of metal halide lamp
HYBRID
A cross between two or more different species.
HYDROGEN CARBONATE (HCO3)
HYDROMETER
An instrument used to measure salinity by Specific Gravity.
HYPOSALINITY TREATMENT
A method for the treatment of ICH
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