I have had some driftwood in my new tank for around a week. I had put it on for the little ones to sit on out of the water and on advice from the pet store I had bought them from.
Apart from the usual discolouring of water which is apparently what is meant to happen, I noticed what looked like white gunge growing on the bottom of the wood, it almost looked like funghi from fish ponds.
I've taken it out and plan to change the water tonight, but is this normal? and is driftwood safe for the RES's?

