My tank is a 30 gal tank. It started about a week and a half after I put water in it as little strings. Hairlike. I thought it WAS hair that made its way into the tank. A strand here and a strand there. Not everywhere like it is now. I would like to know how to get rid of it. It makes my plants (fake) look dusty. Not appealing. It is not bothering the fish. To touch it, it feels like matted white hair. The filter catches it when it is broke off the decorations, but I have to go in and detach it before it will do that. It doesn't just float freely. It is attached to everything in the tank except the tank itself and the fish. I saw at another site that it will run its course? is that true? if not, how do I stop it from growing and how long does it usually last? Thanks for all your help. I appreciate it.