So i have a mixed african tank about 100 gallons. Have some beautiful red tops, yellow labs, blue johannis and a couple rustys. Plenty of room lots of caves and rocks. Ive witnessed cicling behavior but they look like male red tops, how can i tell the males from the females? And another of subject question, would a larger un-proven pair of discus be stressing out the smaller ones and forcing the to hide and hang in corners showing dark color?