I have 6 young axolotls 2-3 inches long . I can either set up a 30 gallon tank for them till their bigger or set up a 55 gallon tank for them that should last quite a while . Any ideas on which would be better ? I feed my babies by hand acouple times a day and that would be easier in the 30 since they are so small but I want to do what would be better for them . Thanks for any help.