That's the thing, first of all, I do in fact think they are all male, secondly, only have four of them, thirdly, I only have a thirty gallon tank that is allready occupied by the 4 male mollies, a tiger barb, and a snail, I have a large slat water filter that, if cleaned out proberly, could be used as a hospital/nursing/quarintine tank as it has three seperat areas, and all of the equipment is not attatched, so I could use it like this for the time being, but do I have enough room for this type of stuff?