HO Lighting: High Output fluorescent lighting.
Holdfast: An organ of a benthic alga that attaches the alga to the seafloor.
Holometabolous: Undergoing complete metamorphosis.
HO lighting: High Output fluorescent lighting.
Hydrogen Sulfide: A molecule composed of a hydrogen and sulfur atom. It is a toxic compound which has a rotten egg odor. It is synthesized anaerobically by unwanted bacteria.
HO lighting
High Output fluorescent lighting, very good for some tanks.
Hydra
A freshwater hydrozoan resembling a small sea anemone, an aquarium pest that is sometimes a problem in breeding because it preys on fry.
It is definitely the fastest growing anubias plant I have kept! In a tank with T5 HO lighting and CO2 I am getting a new leaf every 10-14 days.
 See also: Fish, Aquarium, Lighting, Water, Freshwater
  
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