4x2x2 tank use how strong a pump?

[minireef]

What kind of flow rate should I go for?

[xersion]

i'm using a 5000l/hr

[madmac]

As a return flow or for in-tank flow?

[xersion]

return flow..

[minireef]

yes, its for return flow

[madmac]

what is ur tank's water vol. ? and the sump vol?

I hv read some advocate design based on 'sump vol', so if you want 5x sump, you get a return base on that.... essentially saying that your main tank vol will pass thru ur sump vol 5x in one hr.