There's a huge thread in the light-filtration-equipment forum under hydor korallia ph's U may wanna check it out before u buy. Theres all d info u may need.
I've got 2 400 and 1 850 on my 60 gallon. I like them personally. They do put out a spreding type of flow, which some don't like but I certainly prefer that to the straight unidirectional flow you get from some other pumps. The two larger models are a bit big, but in my opinion they still look better (cosmetically) than a gray box sticking out of the side your tank.
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