On the bottom of my tank there's these HUGE clouds of white stuff that MOVE! they go from one side of the tank to the other and move and up and down the tank...they go where ever the food is...also it completely covered an anacharis plant that is rooted into the substrate and after the clouds moved off it I looked closely and seen very small 'nibbles' or holes in the plant...I tried vacuuming all of this out but it didn't work...they end up coming back DOUBLE everytime I try cleaning the clouds out. What the heck do I have? For some reason the planaria in my tank and snails get as close as possible to this stuff...and the shrimp HATE it...they go near it they jerk back like it was trying to eat them or something...PLEASE HELP! Also I noticed anything that comes near it .. it sort of absorbs it 
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