They are modified to accept tunze power heads. You can get 6065's that will push 1800GPH each. I think for me the reason I went this route was heat in the tank. The tunzes made my chiller run less than the posiedon PS4 I had running.
Basically instead of pumping water out of the tank through the seaswirls the ones I have just mount a powerhead to the sea swirl and rotate the powerhead.
I can't use them because even the smallest tunzes blew sand all over my tank.
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