I want to have a breeding group of 3-4 females and 1 male. How big should the enclosure be for this group? Thanks

Rule of thumb, 20 gallons for the first pair then add an extra 10 gallons for every add on. The species might also make a difference, but I'm assuming you want the more common species like the bearded pymies?

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Kara ~ 1.0 Veiled-Pan, 1.0 Sambava-Hyperion

Ya. I forgot to mention bearded pygmies. How many eggs does a female reproduce in one year? Thanks

Should it be a long 20 gall. or a tall 20 gall.?

Either, but they aren't needy of a 20 tall, so a 20 long is good. And females can lay 2-5 eggs a clutch, with maybe 3-4 clutches, after that they may not be any good.

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1.0 Veiled Chameleon, 1.1 Verrucosus Chameleon, 1.0 Bearded Dragons, 1.1 Crested Gecko, 1.0 Chinese Water Dragon, and 1.0 Mali Uromastyx

Actually, 2 or even 3 adults can be kept in a 10 gallon, however it is recommended to use a 20 gallon for 3. All three of mine were in a 10 gallon for a couple of weeks and before I got my male my females lived in a 10 gallon for a few months.

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Sam, Karma, Titan, Bonnie, Clyda, Rhea, Orcus, Venus, Vulcan, Thor

A group that size would be fine in a 20 gallon.
I would go tall so that the plants have some room to grow and you can do a few inches of substrate without sacrificing all their space.
If you choose to use an aquarium with a screen lid, a small computer fan would not be a bad idea.
Position it to blow across the top of the screen, not into the enclosure, to draw air up and out.
Have you read Tom Routhouska's articles on the e-zine?
If not, I highly recommend you do. He helped me a lot with my brevicaudatus, as did Mike Monge.

-Brad

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http://raisingkittytheveiledchameleon.blogspot.com/
Dedicated to superior care of all chameleons.

You can put 5 in a twenty gallon? Wow, I must be telling people to put them in huge cages. I guess not all care sheets are correct.

well duhh....I would't use a Petsmart caresheet for my chameleon.

seriously though 5 can be kept in a 20 gallon.

I mean the online ones! it's odd that they say to put them in larger enclosures instead of smaller ones though.

Some of the petco/petsmart care sheet would keep an animal alive, though not the best care, but they would at least keep them alive. It makes me mad that they don't even follow their own care sheets though!