I just upgraded my skimmer and am still in awe at how much stuff is coming out of my water. Although it isn't thick, it is dark green, you can not see though the collection cup. BTW, I havent fed my tank in about a week since I lost all the fish.
As far as a UV sterilizer goes, I think in all seriousness I wouldn't get one, first off is cost, secondly I do want my refugium to supply as much food to the tank as possible. I guess even if some of the life gets killed by sheering force when it comes in contact with my pump, some will probably make it.
No doubt there are some nice reef tanks with UV sterilzers, there are some with out too. I would have to think that stocking levels and where your fish are coming from would dictate whether or not to get one. My cousing builds UV sterilizing systems for municipalities, he has said he can build me one for almost $0 if I want one... I still haven't jumped on it.... maybe for my isolation tank though.... hmmm..
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