I'd like a little advice on what to do. I got 3 males and 2 females about 6 months ago around 2 inches. I hoped to try and get the best combo, but a male was killed early on, so I sold one of the females only to have a female get killed, so I'm down to one male and one female. They are almost 6 inches and by what I've read, should be mature enough to breed. I've had them by themselves this whole time. They were in smaller tanks until they got to this size and then I put them in a 75 with no luck in which they hid at the top all day. Currently, they reside in a 60 gallon tank and don't hide as much, but still haven't produced any eggs. Is this a good sign that they're not compatible or should I keep trying? I know I could try some different things and one that I'm wondering about is if I should put them in a larger tank (300 gallon) with other fish or keep them by themselves. thanks for any input.