2 or 3 that small could easily go in a 5 to 10 gallon bare bottom with a sponge filter, or you could keep them in Tupperware with 100% daily water changes. I don't use any substrate until they reach 5 inches, and I would avoid a filter with current until they reach that size also. Mine do really well on a diet of live blackworms, thawed bloodworms, and chopped earthworm at that size. Ask the breeder what they have been feeding, and try to offer the same for the first couple days. Good luck with your new babies!