Well, I have another question. I need to re-aquascape my DT and I was wondering, all my animals will remain in the tank, what problems might I run into by re-aquascaping? I'm having to change my overflow system and don't want to drain the tank to do the switch. The overflow will be shut down for maybe 2 hours and then it can be back online but the rocks will still be needing to be moved. Thanks in advance.