Quick stats: 10g for a single axl. You can have like 10 in a 20g. They just tend to get a bit cannibalistic. But just like a bad haircut, it will grow back
They prefer cooler temps <70°f
They will eat ANYTHING that's smaller than their heads. Worms are just a good diet. Also stupid cheap at petsmart. 3 bucks per container that'll last these guys 2 weeks with 1 per day
Overfeeding can be an issue, you're only supposed to feed them as much as it takes to make the stomach as big around as its head.
They don't have any special lighting requirements, as their natural habitat is underground around Mexico City.
Last I check they were critically endangered, due to the contaminates being introduced into their water
Their being studied by stem cell teams because of their regeneration capabilities, for human benefits
They're different from other amphibians because they don't go through metamorphosis due to a iodine deficiency
You can "evolve" them like a pokemon and force them into metamorphosis with iodine supplements, though I'm not sure how much, (or why you would)
Not sure what the cost is anywhere else, but for the standard black, its 20 bucks here, special colorations like albino, lusistic (dirty lucy), gold, pie bald - are around 3-4x as much.
Quick wiki link
en.m.wikipedia.org
