Hello! New to the hobby, my daughter decided she needed some fish. Naturally she went out and purchased the beginnings and then handed it off to me. Usually I would be aggravated but I have found a love for the aquarium. I caught the bug and now want to do it right. I have a 55 gal saltwater with about 50lbs live rock, 20lbs give or take of mixed live and reg. sand. Running the filter system it came with, a tetra whisper 70, and 2 koralia 750 power heads. The tank has been up for a little over a month with 1 clown, 2 fire gobies, a red banded shrimp, and the generic cleaning crew of crabs and a snail or two. I need to get a protein skimmer but I have a lack a space so a hang-on model is going to have to do it. I would like to eventually get into some corals so I don't want to have to go back and upgrade all of my equipment. Any help I can receive on the best hang-on protein skimmer for where I am planning on going would be appreciated. Thanks