Agreed with the heater idea. Even with the new lights, which look super stunner compared to the old btw

, the back corners are still dark. Could you possibly move them closer to the side panes where the darkness could be used to your advantage? That should allow you to not have them so far down, thus giving you easier access.
I really like the scaping. The little hills that are visible in the sand from the front of the tank look awesome.
As far as painting your Rena (I am right about that? Rena loves that ugly blue lol) intake, just do a little google searching for non toxic paint that will last under water. There is always the choice of getting glass intake. I think they have a few at
www.GreenLeafAquarium.com used for being discreet in a planted show tank.
Hope this helps. Looks great btw, can't wait to see pics with the little guys in there!