Currently there are not too many Brookesia keepers in the US. These tiny chameleons are not long-lived, and there have been few that have come in with the import shipments in the past year or so.
There are by far more species of Rhampholeon coming in than the Brookesia.
Either way, these little guys can be tedious to keep. While the Brookesia come from Madagascar - and the Rhampholeons from everywhere else - the housing temperatures and humidity requirements differ respectively.
For both Brookesia and Rhampholeon:
You can keep small groups in 15-20 gal aquariums - but you must be careful not to have 2 mature males together.
Substrate requirements will differ with the sub-species, as would temperature ranges.
Food intake is much the same: very small crickets; termites; hydei fruit flies; etc.
Due to their size, it is not easy to treat them for parasites or other illnesses. Most vets would scratch their heads if you were to take them in for diagnosis.
There is a yahoo forum that is dedicated to these little guys - do a group search using the word Brookesia - you will find us. There are experienced keepers who post about care and problems (folks like Andrew Brinker(host); Chris Anderson; Trevor Dell; and many others). Once you identify which kind, you should be able to get much more detailed information.
Hope this helps,
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