When getting a skimmer alway get it rated for more than what your tank is. For your tank I would get one rated for approx 100+ at the least. I have a Prizm skimmer on my 10g and it is rated for up to 100g. And good for you in going bigger, I think you will be glad you did in the long run. Words of advise " Reaserch & Patience" that is the key to SW, and from the sounds of your messages your already in the right directions. Look forward to pics.