Andrey, Depending on the species and in your case the Ramirezi is a very peaceful and shy species. The Bolivian Ram (Microgeophagus altispinosa) are more outgoing and will defend themselves against much lager species. The Satanoperca group, although a large species are very shy and are not aggressive in any fashion. It all comes down to the size of tank and careful choice of tankmates. Helen >>Simply I always reckoned that Cichlids should be the masters in the tank Andrey<< ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!