Hello, this is my first post, I have a 55 gallon planted tank with a cascade 700 filter and also a tetra 10-30 filter, it is an established tank. My question is what can I put in this tank with 1 electric blue acara. I have 1 bnp in it now, I would like to go with a school of fish, I thought rainbows but I've read the temps would not match, something with some color would be nice and peaceful is a plus, thank you