im not sure if this is correct, but the male rosy has a black dot on their head? im trying to breed them right now in a 2 gallon tank, no heater..with filter and airstone XD, 1 male 1 female rosy in it... i know its kind of small but i've never done this before so im just giving it a try..i bought 12 from the store and when i came home only saw 1 with the black dot on the head..please give tips if u know any thx~