Ok I didnt realise this was a serious thread about the diet of Mr gibbi.
I have found that when my guys were being beaten to the wafers etc, I started attaching pieces of pumpkin, zucchini, lettuce (not ice berg) even sweet capsicum to a weight, fed alternately with OSI algae discs they all have little pot bellies. Its a cheap and very effective method I have found to keep my L's happy and very healthy as pellets and wafers on their own just aren't enough, imo.
Like i said he is a beauty with a slightly sunken belly that needs a little attention. Good luck with it as it is an easy fix.