awesome, thank you. I thought I was buying gold fish for my 30 gallon and found out later they were small koi. Anyway, I have a snail problem and noticed in my dad's gold fish tank there were no snails so figured maybe they would eat them. Perfect, now the cool temps will help the java fern and the koi will eat the snails that are destroying it. They seem to think the java fern tastes nasty.