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it might work, my concern would be that if some some reason that filter were to break siphon, it may be an issue(like for example in a power outage) . are you considering doing a larger tank at some point? that butterfly is going to get big
i agree, you'll be fine with just using the one kessil puck, being that your not looking to go SPS dominant, that should be plenty of light IMO
im running the 1 pendant and i am getting plenty of light....also know that i have this thing dialed down to about 20-30% intensity