Awesome! Rummynose tetras are great little schoolers, I've wanted a school for awhile. They would look great with your scape!
I've read that cories and kuhli loaches will be competing for the same food, do you think that could be why your juliis are having trouble?
Perhaps. I never ruled it out, but the kuhlis were so recluse. I hardly ever saw them. The cories didn't seem too shy about getting theirs come feeding time.
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