:help: I have different fish in my 100 gallon tank, and feed different food to them, however i feed my oscar dried cubed tubifex worms, cleaning my tank this past weekend noticed alot of worms in the water swimming around. they look like the earthworms you see on the ground after a good rain, but much smaller, is this a parasite in the water or is it from the food? and if it's from the food why aren't the bottom feeders cleaning these little guys out of my gravel for me?