So I've asked the question of what kinds of algae eater I could put in a 10 gal. cold water tank a million times on here, but I have another fish in mind. My girlfriend has a 10gal. cold water tank with a goldfish in it(soon to be 20gal.)and there is nothing in there for the algae except for a couple of snails I gave her from my tank. Anyways I just found out about hillstream loaches, and I was wondering if I could put one in a cold water tank? Or will that kill it?