could i put a pair of FMs in a 20 gal for lifee im still dont know if they are a pair yet i no one is a male ant the other doesnt llook like a male, it looks like a female but it is still small. anyways could i put them in a 20 for life with either some pristellas as dithers or a few swordtails? if they turn out to be not a pair ill just keep one. so could i keep 2 FMs with a fer smaller dithers in a 20 gal long for life. or would it be better without the dithers.