*** UPDATE *** This stuff is now growing like a fuzzy/slime? on my driftwood... Any information would be greatly appreciated! So I just started a 75 gallon tank this past Saturday and by Sunday morning it was completely covered in this white stuff. All that is in the tank is some gravel, 1 fake plant, a large piece of driftwood (with some snails) from my planted/established 55 gallon, a sponge filter and HOB filter (rated for 75 gallons) with built-in UV sterilizer. I used water from the hose (as I always) do and treated accordingly with dechlorinator. Its now Tuesday and it doesnt seem to be growing so much other than on the sponge filter. I've never experienced this with any of my other/past tanks. Does anyone have any idea what this is and how do I get rid of it?!