11-13-2009, 05:13 PM
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First thing: Get the tetra and goldfish out of the tank. Second thing: Coarse gravel or marbles or java moss to catch the eggs. Third thing: There is no third thing. If you have both males and females, and you take moderately good care of them, they will breed. if there's nothing else in the tanks that will eat the eggs, you will have fry. White Clouds are not big fry eaters, so you'll have fry surviving. They can, I believe, take powdered flake from the outset. Also, check your temperature. White Clods are NOT tropical fish (neither is your goldfish, for that matter.) They'd prefer high 60's to low 70's. (Your tetra, a Pristella,BTW, would prefer temps over 75)
If you want to jumpstart this, then live food is the way to go: Blackworms, white worms, or grindle worms in a cone feeder are your best bet. (Mike Helleweg gave a talk at PVAS last year on cyprinids, and his generic advice on conditioning them for breeding was, "If you want their bellies to fill up with eggs, first fill them up with worms.) If you can lay hads on Daphnia, those are good to. If nothing else, set yourself up a brine shrimp hatchery and feed them baby brine shrimp. Better still is you give them a soak in HUFA supplament before feeding.
If you do get a bunch of fry, and you want them to gro out quickly, a daily water change with parameter matched (temp/ph/hardness) is really helpful. So are multiple small feedings daily.