Rw-4 for 21 gallon cube 20x20x12 would it be good?

[2reefs]

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.

 

[ecvernon]

An rw4 would work well. At times it could be too strong. I use one on a Nuvo 20 gallon. I'm also using a tunze power supply and run it at a lower voltage just to get the perfect flow with out creating a sand storm

 

[ecvernon]

The supplied controller could turn it up or down so it should be no worries

 

[theMeat]

You can't it down in all modes. If in a mode that flow can be turned down, you should be good.

 

[2reefs]

The supplied controller could turn it up or down so it should be no worries

Awesome looking tank.

 

[2reefs]

Thank you guys

 

[2reefs]

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.

 

[ecvernon]

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