2reefs

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I have 21 gallon deep blue cube 20x20x12 I was wondering if I put 1 rw-4 would be good or too much. I am starting this tank and keeping lps and sps frags.
 

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2reefs

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Glen Rock NJ
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Just decided to buy a new rw-4/pp-4 it is the new name came in a pp-4 box. I am amazed how small this. I replaced the hydor 425 gph by this and what a difference chose
W1 and the lowest speed. Can not believe how strong it is could not keep any higher. If anyone has better setting willing to try.
 

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ecvernon

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If you would like to try the other settings you could get a variable voltage power supply and run it a lower voltage.
Something like thishttp://m.fish-street.com/12v_to_24v_power_supply_for_jebao_rw__fs__wp-60_wp-40_wp-25_wp10_replacement_pump
 

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