12-29-2006, 04:33 PM
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I will have to dig out a graphic for you to help identify the proper fins, but it's not difficult to tell male from female.
As for your other female not getting pregnant again, the only way to ensure that is to keep all females or all males. If there is male and female in the tank together, you can expect them to breed, you won't be able to prevent it, no matter how many fish you add.
Also a note... when the fry mature, they will inbreed with each other and/or parent fishes if they are still together. This is not a good thing to do, so you'll want to watch for that. Inbred fry have a lot of problems, and the more inbred they are, the worse the problems get.