This is my second attempt with my 55g for salt water. The first experience went very well until something went wrong and algae destroyed my tank. I will admit that I hurried into it and probably didn't let it cycle much. My questions start at the bottom. I really hate paying the high prices for the bags of "Carib-Sea" or whatever the name of it is. Is there a cheaper solution? I have an excellent source for live-rock so that is not a problem. Close to where I live is a place called "Inland Aquatics", they sell "system water", but to fill my tank would be expensive. Can I use tap water? Lastly, I would like a good hang-on protein skimmer. I didn't have a skimmer the last time and I think that's what killed me in the end. I would like to start working on this as soon as possible but wanted to get some idea's from all of you first. Thanks for reading and any help would be appreciated.