I am in the process of changing my 90 gal. salt water tank over to fresh water. Main reason is it will be cheaper to run. I have it all cleaned I spent close to 3 weeks cleaning the tank out. Everything in it I tossed out I plan on buying new stone and sand for the bottom, I am also running a 20 gal. tank below to help with the filtertration and to alos get my plants growing. My main question is what all equimpent will I need to run and should I also get a new protein skimmer. My last fresh water tank was a 10 gal gold fish tank back in high school. I have an idea on my fish I will be putting in it and I will have all live plants and my girl friend wants a pirate ship in the bottom.