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Tiny white worms growing in the tank

bettasvancouver - The worms you see on the side of your tank are Rotifers. The do no harm to you fish in fact your fish will love to eat them. Rotifer are white and they stick to the sides and bottom of the tanks. Size biggest i have seen is about 2cm. - Jan 11, 2001
Dyna - I do not believe that the 'worms as rotifers. Most rotifers are round, or at least oblong in shape. There stingy looking whitich things that creep and crawl all overht esides adn bottom of tanks are usually species fo a paramecium. I've looked at one under a microscope adn compared it to an invertebrate biology text and they fit more into the classification of planaria than rotifers. I've noticed that the more microworms that a tank has, the more of these other worms are present. I am assuming that is because hte planaria are using htem as a food source. They grow up to a 1/16 of an inch in length and can be seen squiggling through the water as practically formless clumps. - Jan 11, 2001
bettasvancouver - I beg to differ rotifers come in a large variety of sizes and some cna be seen very clearly with the naked eye. Take a look at the link. - Jan 11, 2001 link
pnutz01 - When talking to a petstore owner who has been breeding fish for 20+ years she said that the rotifers can decrease the oxygen in the tank. While for bettas this might not be fatal (as they are surface breathers) I do know that my tank full of week old fry died within a week of theses things showing up. Coincidence? ...maybe...but I still try to get rid of them - Jan 11, 2001
- These worms are call planaria. They are harmless and multiply if there are too much food left over. They start out about 1/16 of an inch and then some grow as large as 1/4 inch. They seem to grow in the outside filter media and disperse throughout the tank. There would be masses of them in the middle of a clean bare bottom tanks all squirming together similar to what I have seen tubifex do. -
Donna - Your teensy white worms are most likely planaria, harmless to the fish and often eaten by them. My spawning tanks always seem to have them when the fry are very young, but they disappear as the fry grow big enough to eat them. You are unlikely to actually SEE rotifers (not impossible, though, with some types if your eyesight is a heck of a lot better than mine), as these are microscopic and a favorite food of newly hatched fry, along with infusoria. They are much more likely to be swimming IN the water (that's what they do ... swim and make a circular movement of the water, hence their name, from ROTA/wheel) rather than crawling on the glass. - Jan 11, 2001

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