I have 20 gallon Reef tank and i have a Berlint Airlift in the tank. I dont like the idea of the skimmer being inside the tank. Is a prizm the best way to go. I think that a skimmer in the side tank besides being an eye soar is a hazardous to the tank. Am i right can you guys reccommend one for under 200 that will be up to par. Is this good for me a Prizm and what does the add on kit do for it.