Nice choice on tiling the floor... though I bet it was a time consuming job to move the tanks out of the way then back.
How's the tree tank? Did you figure out a lighting solution?
I love the 90p rescape. What is the hardscape... is it all stone? I'm trying to figure out from the pic how you built it up, created the rock island look. Very cool. It will look great filled in and with a sand front. Your designs are always impressive!