Hello. I'm moving soon and decided to get a 55 gallon fish tank for my room. I have my mind set on two things. I was thinking I would love an oscar but I would love to get a variety. I would like this; 3 silver dollars, 2 clown loaches, a clown pleco(4" long), 2 pictus catfish, and 3 angelfish. Is this a decent selection? I have a few years worth of experience but I have only kept small tanks. I am so excited! Also note that I have a local fish shop that BUYS and sells fish so when any fish outgrow my tank, I will trade them in. I plan to perform weekly water changes of 30%. Is this pushing it with all these fish or would it be ok?