I'm using the RS300 on my 150 SPS tank and the RS75 on my 27 Gal cube. I think they're awesome. In Lethbridge Red Coral can get the in and Homes Alive carries them. Animal world carries them in The Hat. I bought my last one from Kelly at The Reef Shoppe. For your 90, the 300 would fit in the cabinet just fine and you'll have lots of space for a skimmer.
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