The male was more colorful & smaller, the female was huge compared to him. They were in a very busy community 90g tank. Actually, I'd have to leave the lights on, so the rainbowfish wouldn't eat all the eggs. I think I read somewhere that beefing them up with bugs/crickets put them into breeding condition. Also the 50% weekly water changes keeps them in prime condition too. These are FW fish. PH in that tank runs around 7.8. I only have one adult male left from the fry, he ate all his brothers & sisters. The parents died from being boiled from a heater malfunction. :sad Mom & Dad cleaned off the glass & Dad would fan the eggs & ward off any intruders. The rainbows would eat the eggs from below. I thought there would be a better survival rate if I left him to fan the eggs as close to hatching time as I could (there were several hundred). Then I'd scrape them off & put them in a seperate tank to hatch. I believe it was about 5 days from laying to hatching. I started feeding the tiny specks of fry with Liquifry.