Hello Frode Johansen If you are going to try and put 2 different species of apistos in the same tank, you need a much larger tank than a 15 gallon tank. In my experiences, 2 adult males will fight, even if they are 2 different species. I would suggest you try the one pair in that 15 gallon tank and let them raise their broods in that tank. If anyone else has had better luck than i have with 2 species in the same tank, make your suggestions please. I have never had any luck trying this. John ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!