Advertisement Out of all plces I saw 4 apisto assorted “cockatoos” at petco and I bought 3 of them. Unfortunately I plan to breed them but they all look like females, ie no crest, yellowish hues, and no ventrals. Granted all of them are about 0.75-1” and I’m pretty sure that some of the other fish in the tank back at petco kind of beat them up a bit. However I noticed that at the store two of the smaller ones kept flaring and following each other through the glass and would swim away only to come back. They kept flaring and when I added them to the tank they explored the tank as a pair but they slept by themselves...would these be a pair? At their size would it be reliable to sex them?