I feed mine the sera for algae grazers... The also get shrimp crushed up de-shelled peas some random discus food the discus dont eat, white worms, and anything else I can find..
I have heard they are prone to bloat as are most africans that predominantly eat algae, which is why I only feed them non-algae based food once a week and the sera food the rest of the time, before I sera food I used cichlid spirilina sticks and they did well but I was using a big container a week lol
The flake on trademe if its the same stuff I got is really good for the fish, however I had trouble with it making my tanks turn green (very high in phosphates) dont know if your looking at the same stuff I got but I dont use it because all my tanks were lime green and people looked at me like I didn't look after my fish lol