With an assumption that all parameters are w/in acceptable ranges, wont bother asking but worth checking and record if you havnt.
Although had faced with Malawi Bloat with few Mbunas, I had worse experiences with T. moorii from Lake Tang back in late 80's and early 90's. However, I pretty much eradicated these problems when I realized that they maybe taking too much food at one time as these are grazers. Either reduce amt of its intake per feeding or break up same amt into two or three smaller feedings, making it easier for them to digest per feeding.
For Mbunas, I usually mixed-in bit of Hi-Pro flakes to spirulina and veggie flakes and had no issues as long as they did not stuff their faces. Upon arrival of duro flakes (early 90's), these hard corn flake type of flakes yielded lot less occurences of bloating which I credited to their hardness which may have contributed longer time to chew and such prevented overeating per feeding, compared to thin standard flakes which they will guzzle up as much as they can in no time. Good-bye to these thin standard flakes forever since....
For T. moorii, I strictly stayed with spirulina/veggie duro flakes combos.
Hope this helped a bit