As you probably already know, Tropheus are prone to bloat. Practice extra due-diligence when cleaning the gravel. Keeping any rotting food or waste out of the rocks/decor is much more important than what you feed them.
Contrary to popular belief, you can feed Tropheus meaty foods such as blood worms and brine shrimp.
I have bred and raised Tropheus feeding them both of these frozen foods several times per week and never had the tanks get bloat. I learned this from a very experienced breeder and wholesaler who feed all his Tropheus brine shrimp every single day.
Live baby brine for the fry all the way up to adult brine for the juvies and adult breeders.
Almost everyone will probably disagree with this, and I was skeptical at first but, I tried it and kept with this food regimen constantly when I kept Tropheus.