02-07-2008, 04:27 PM
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I hate to say it, but your tank will be overstocked, even without the cories. Also, do you know at what size your LFS will accept the guppies? Guppies give birth to 20-50 fry at once, and usually an LFS won't accept them until they're at least 1 inch, which takes about a year. So two guppies giving birth to approx 35 fry once a month would mean way too many fry. Another option would be to allow the fry to be birthed directly in the tank, and most of them will be eaten, which is a good nutritious food for your other fish, and a good method of population control.
Also, cories should really be kept in groups of at least 4-6, otherwise they will be so shy that you will never see them. There's no point in keeping fish improperly, because you won't get to enjoy their amazing personalities!
Sorry if I've sounded harsh, but it's a reality check that will save you a lot of pain, time and money in the future. Best of luck!