After some mistakes with freshwater I got a disease in it that rapidly wiping out my fish so I will basically wiping out my 55g. I will basically need to start over on this tank, so I want to make sure this tank I get everything right. So. Everything you guys wish you had known when you had started, just type it up, and I'll read it all to make sure I don't make a lot of mistakes. Anything flies, please help.