I think for a tank size like that... the 820's. Considering I use two Seio 620's in a 20 gallon tank.. and it's pretty decent. I know I could add more water movement.. just have no room!
I say go with the 820's, especially if your wanting to keep the SPS corals. JMO.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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