If you took em form a 20g with 15 other fish, good for you! Keep them in your 30g, do weekly water changes, give them a variety of frozen foods, and generally provide them with as good of a home you possibly can, while saving for a 55 gallon tank simultaniously. I will promise you your fish will be much happier in a larger tank but if that isnt an option right now, just keep the water clean. Everyone around here is always telling people to donate to an LFS, when in reality in a LFS they are usually in a much worse situation and are sold to people who dont know anything about them. Good on you for coming here and trying to learn about them!
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