I'm going to be doing a big cleaning (100% water change, maybe moving stuff around, scrubbing the sides...ect.) and while I was doing all that I wanted to add some more driftwood. I have a small piece in there already, but I was wanting a larger piece. My tank is a 55g, so would an 8-12" piece be too big? Could I get a bigger piece? Also where would you recommend to get the driftwood? Thanks!!