I take it you guys have not owned a payara species. they will not even eat a 1'' fish they just kill them and let them fall to the bottom. A full grown convict at 4'' would be right up there alley in a few months. And a 2''-2.5'' is fantastic right now. I have 2 red tails. My freind has some con fry which he gave me 20 2''ers of. i put them in the tank and went to the grocery and came back and they were gone. The Tats looked as if they might explode. So thats why I needed to set up a feeder tank and now a breeding tank. I have done guppies for years and they are not worth the trouble, trying to catch all of them before they get eaten. Or catching a pregnant female and sticking it in a net to have birth. i am done with that. I want a quick breeding fish that takes care of the fry. And I think a con is perfect for that. Or is there something better to breed, that will breed faster with more offspring and not eat the fry.