ok well my buddy gave me two frontosas about a month ago becuase he bought two of them and he did not do his research about the fish and had them in a 20 gallon tank, so once he found out how big they got he figuared that it was going to work out. so he gave them to me. they are only around 2 months old. they are both 6 stripped. but how old or how many months do i have to wait to see if they are male or not. i really like the hump in them. i know males get bigger humps then females do. but how long do i have to wait. and for all you asking how big my tanke is it is 125 gallons so i think that will be ok for them. thanks for you help andy