01-07-2012, 01:37 PM
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Swordtail should have more room, at least a 30-inch tank. They will grow (if healthy and they live) to 5-6 inches and need swimming space.
We have profiles here, with this sort of info included. Second tab from the left in the blue bar across the top of the page, or in posts if the name shades click on the name, example Swordtail.
Be careful on male/female with livebearers (like molly, guppy, swordtail, platy). You will have hundreds of fry continually, and this will quickly overpower the biology in a smallish tank.
And, welcome to Tropical Fish Keeping forum.