i'd pass and save your money and buy a good skimmer. one of my biggest mistakes in the reef purchases was buying cheap skimmers when i first set up my tank. buy a euro-reef or another well known skimmer.
I bought a prizam, a prizam, a prizam, and a prizam pro deluxe. When you add all of those up you have 2 euro reef or euro reef clones. That makes me a dummy. Do they work. Yes. Do they work well NO!!!!!!!!!!!!! One thing I love is that I can learn from others mistakes in addition to my own. Dont be like me and spend money on something you just have to buy again for more money and have 500$ invested in stuff that you are not happy with. I dont hate my pro deluxe, but somedays I want to shoot large holes in it with my SKS. I have seen the ASM aqua G in action it does well. If I understand correctly it is a euro reef clone from someone who used to design for euro reef. Dave at www.vividaquariums.com has them on sale right now. HTH Steve
Ok read previous post on the prizam pro deluxe. It is rated to 300 gallon. It should only be used on tanks less than 100 gallon. It will fit perfectly on the side or back of 20 long. I have one on my 20 long sump for my 75 gallon tank. If you have to have a hang on it will work. It is just a hassle, and requires frequent adjustment. Here is something I have noticed. If you adjust it in a low pressure zone weather system and the weather changes to high pressure it will overfoam and over flow the cup and the one gallon jug I use catch skimate. I know that sounds weird but I have seen it happen over and over again. Did I mention that I want to take it outside and shoot holes in it with a SKS. Good thing I have wood floors. I know the thing about the weather effecting it sounds weird but it is the only thing that changed about my tank. Steve
A lot of times skimmers are over rated by their mfgs. i would cosider a skimmer to do only 1/2 to 3/4 of what the gallon rating. specially since people overstock their tanks. We often as hobbiest never plan enough ahead to oversize our equiptment there fore it costs us more in the long run. most hot skimmers are very limited in their abilities. Someday if you stay in the hobby long enough you will find that a sump will be larger than your tank that you plan on now. My system on my 75 is large enoght to go to a 200 gal system with no adjustments at all. it cost me more in the set up of my tank but it has been much better on my livestock.