Ok, so, I want to get some Corydoras!! The thing is, I don't know what type. I'll either get a TON of Pygmy Cories (my lfs has them for $2 each) or at least 6 bigger ones. I'll be putting them in my 30 gallon tank. They are scavengers, right?? I was also thinking about making my 150 into an Angel Tank. What do you guys think??