Recently ive been noticing my black moor Bubble's has been chasing my fantail Squeak alot. I thought it was maybe just bullying around feeding time and ive been keeping an eye on it. Today when watching them swimming ive noticed white spots along Bubble's pectoral fin. So Bubble's is a boy, i thought he was a girl. I then had a look at Squeaks pectoral fins and there are no spots. But i had a look at her bottom and i think i can see her wen sticking out. Looks like ive had breeding behaviour on my hands

Boys will chase boys if no female is available. But a sticky-out vent is an indication that a fish is female. If they spawn they will eat the eggs, so if you want babies remove the adults after spawning.