Ok, so while my tank is cycling I've decided to start planning what I'm going to put in it. The tank is 29G, and has a Tetra Whisper EX45 and a EX30 filters. This is what I've come up with:

4 guppies
3 platys
6 cardinal tetras
6 longfin red minor serpae tetras

I've read that the serpaes may nip the guppies. Will tis happen even if I have 6 of them?

Do I have space to put it a couple of corys?

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New to this and loving it! 29G all live plants, woood and rocks, 5 denison barbs, 2 synodonstis zebra hybrids and 8 guppies.

I think you would technically have enough room for corys but the problem is that I'm guessing the serpaes will indeed fin nip the guppies, especially because you only have 6. Also guppies, platys, and corys should be in larger groups - 5 or 6 is about the minimum, but if you want to have 3 or 4 different species then it would be advisable to have no less than 7 of a specific species of those fish (if nothing else to prevent possible aggression).

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30G planted aquarium with Aquaclear 50 and two Aquaclear 20s. 7 Cherry Barbs, 12 Cardinal Tetras, 1 Albino Bristlenose Pleco, 1 Golden Honey Gourami, and a handful of Ghost Shrimp.

Guppies and platys are not schooling fish and you can have 1 or 3 or however you want.
Between the tetras you might want to stick with just one kind and up the school somewhat. But be prepared for babies if you get female guppies and platies.
Cories do best if they are the same species. In a 29 I wouldn't put more than 3 or 4.

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SUCCESS IS MEASURED BY YEARS, NOT MONTHS!!!
220 Tank build
http://www.aquariumforum.com/f15/sta...late-3253.html

Are you certain of this? Nearly every site I read that has information on guppies says they are happiest in groups, as does one of the books I have. (It says that while they aren't necessarily schooling fish, they will be stressed if not in larger groups, especially if potentially aggressive fish are present.)

Is this old information, or just plain wrong?

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30G planted aquarium with Aquaclear 50 and two Aquaclear 20s. 7 Cherry Barbs, 12 Cardinal Tetras, 1 Albino Bristlenose Pleco, 1 Golden Honey Gourami, and a handful of Ghost Shrimp.

Just plain out of date and wrong. Guppies and platies being livebearers, One male will be happy with just a couple of females. They are also just as happy being by themselves. But the way they like to breed they are happiest as long as there is 1 or 2 femalse.

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SUCCESS IS MEASURED BY YEARS, NOT MONTHS!!!
220 Tank build
http://www.aquariumforum.com/f15/sta...late-3253.html

Should I get the guppies and platys in pairs then?

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New to this and loving it! 29G all live plants, woood and rocks, 5 denison barbs, 2 synodonstis zebra hybrids and 8 guppies.

I never heard that guppies or platies needed a group....def must be outdated information

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"Being ignorant is not so much a Shame, as being unwilling to learn".-- Benjamin Franklin

You can do pairs, but do better in trios of 1m 2f. But be prepared for babies. Both adults will eat fry though if there isn't any hiding room for the babies.

__________________
SUCCESS IS MEASURED BY YEARS, NOT MONTHS!!!
220 Tank build
http://www.aquariumforum.com/f15/sta...late-3253.html