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The clicking noise is from the impeller spinning backwards. The only way to not have it do that is to not shut off the impeller. The Seio controller ramps the power up and down (like Chull13 said, to about 50%), so you don't get that noise.
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Craig & Holly
1-75g FW Planted
1-55g African Cichlid
1-125g w/ 4 turts
1-75g RR Reef
1-12g NC Mantis, 1-12g AP Brittle Star
2-cats
2-dogs (1 Catahoula Leopard Mix & 1 Shepherd Mix)
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