yeah i have some Ps. Crabro (possibly one male one female) the one i think is male goes all black at night when i turn the lights off, problem is the other one sometimes hides its color (like a subdominant male) only he can never go straight black... thus the reason i think it may be a pair i can link pics once i take em so next post i will. both have eggspots on anal fins as well. less on the duller colored one. they are both about 3-4 inches nearly full grown just in the tank with an auratus so maybe thats why they wont take their true colors idk. plz gimme advice on how to sex em and yes the auratus are going back to lfs :**( o well lol.