03-24-2011, 03:04 AM
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Filters are not your only worry with the stock combination you have. You might want to rethink your stocking plan.
As bettababy said, your rainbow shark will get big enough to eat your smaller adult fish, as well as any guppy or platy fry that are born in your tank. Which there will be, unless you have all females or all males. By the way, male platys get aggressive with each other, so hopefully you have either all females, or only one male with your females. The female betta will also probably eat your fry, once she is full grown. If you don't want an overpopulation problem, having a fish or two that will eat the fry can be helpful, although the adults of the same species will usually take care of that by themselves. However, having fish that will likely attack your other adult fish isn't good.