Discussion in 'Freshwater Beginners' started by jayham26, Apr 4, 2010.
I was wondering what is hydra?
Hydra is a genus of cnidarians, or aquatic animals, that look a bit like sea anemones that went on a heavy diet. They can be harmful to fish fry and small organisms like baby shrimp and snails in an aquarium, and are a nuisance as even adult fish get irritated when brushing against their stinging tentacles. Hydra are often introduced into the aquarium hitchhiking on plants or driftwood.
Are they able to be seen in a tank, I mean are they big as fry or smaller?
They're whitish and a bit hard to see, but are definitely visible. Look for a thin sea-anemone-like thing on your plants, glass, heater, or any surface. I'm guessing that an average hydra (the one in aquariums) is 1/5-1/4 of an inch high.
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