So we went and picked up 6 free goldfish. The people didn't want them anymore. Right now the goldies are in my largest open tank, a 30 gal. I don't think they mind too much, when we picked them up they were in a 5gal bucket. They will very soon go in their own pond, seems a couple are about 6in long. Now, I was never a giant fan on goldfish, so a little help is needed. What kind are these goldfish? Thanks in advance!