I've notice some small (and I mean minute) white 'worms'(?) on the inner glass of my tank - I think they came in on some plants I bought recently - do I need to be worried? They look much like the really fine, white hairs you get on some floating plants long hanging down roots... I wiped them off with an algae cleaner and they floated off into the water... where my glowlight tetras 'seem' to be eating them...