I have had my tank seup for over 8 months now and am a bit over the look and I want to completely rearrange the setup to get it looking better and different is it ok to fully change the rock and plant setup while the fish are inthete and fully established. And would it stress the fish out or would they like a change or rocks for a new feel and setup to discover I do. Know if it's ok to change it so any suggesions will be great thanx