I used to buy my 4 mnubas back in the day about15 every month or so and I never had problems just not all the time I figure a little wild food brings them back to Malawi LOL really though that's the only reason I feed mine occasionally live food except like a wild caught predator then I still don't know if it's nessasary but now I can't get my hands on them I usually just get like a few neon tetras every couple of months from healthy looking specimens kinda expensive food though 1.99 a pop