I just finished cycling a 55 gal fw tank. It has 4 goldfish in it and I did some research online and couldnt find anything about not putting goldfish (small ones) and dojo loaches together. Now I have 1 loach that is looking kind of listless and I've actually had to nudge him a couple times to make sure he wasn't dead but the other one looks normal. My 6 yr old son just said he saw one of the goldfish bite the healthy looking goldfish near his mouth. I was just wondering if it was a mistake to put these fish together in the same tank. I'm not planning on leaving the goldfish in there, just wanted to add a couple fish to increase the biological load before I take the goldfish out and replace them with something else. Any help would be greatly appreciated, thanks.