Fly Fishing Techniques

fishmom says:

They won’t hurt your fish although they probably aren’t attractive to look at. A lot of fish like to eat those, so you might try to see if you can’t swish them back into the tank and get them to eat them. Once they’ve figured out that the little worms are tasty, they’ll probably hunt them down on their own for a little snack.

If you’re treating for white spot disease, or ich, you should also be putting salt in the water (not for catfish who can’t tolerate the salt). The salt will also get rid of the little worms. Be sure that you increase the temperature of the tank to 84 degrees and treat long enough for the entire life cycle of the ich parasite. It has three stages, and medication is only effective during the swimmer stage. It is really important to continue treatment after the white spots away, for up to three weeks.

lei-an D says:

there is probably a dead fish in there. move rocks, look in caves do anything to get it out. they will not go away till you get the dead fish out. i have never had this happen to my tank. get your water tested make sure there is nothing in the water to make them come. is your tank clean? if not clean it. do water changes if you dont.