i am new to keeping fish and have had my tank around 6 months now i have 5 cichlids,(2 yellow, 2 convict and i think its a pink one) 2 plecs, 6 tiger barbs. all was fine untill recently when the yellow cichlid (the larger of the 2) keeps attacking the large convict infact it keeps going for all the fish exept the plecs! what do i do? ive been told i shouldn`t keep african cichlids with american ones

?? can someone please help me by giving me some answers mamy thanks, i like all the fish and really dont want to have to get rid of the yellow ones he;p! 



