10-01-2008, 12:17 PM
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The inch of fish per gallon rule is really a terrible one. Some people say it's more of a "guideline" than a rule, but even that's poor advice if you ask me. Different fish have different tank size requirements. You need to take into account bioload, aggression, swimming patterns, etc. when stocking fish.
I don't think the African dwarf frogs are a good idea in that tank. They're very slow, methodical eaters and tenacious fish will often eat all of the food before the frogs can get to it. In my experience, platies are really, really enthusiastic eaters (i.e. little piggies) so I'd be worried about your frogs starving. You could try it, but you'd almost definitely have to spot-feed the frogs with a turkey baster or forceps to be sure they got some food at each feeding.
As far as bioload goes, you're already pushing your stocking limits with those 8 platies, and unless they're all males you're likely going to have more than 8 of them in the near future. You could certainly give some away to friends, or even give them to a fish store. You won't likely get any credit for them, but it will give you more room in the tank. If you gave away half of them, you could probably get away with a shoal of 6 pygmy cories or six small tetras like neons or ember tetras.