How do you filter your 180?

[Oscar Mike]

I heard somewhere that a sump should be around a quarter of the tank volume. For a 180 that would mean around 45 gallons give or take a couple gallons.

That's a decent estimate, but I've heard you really only need to measure the volume of water above the standpipe and then double that to account for any water in the plumbing during a power outage. So for example, a 72x24x25 180g with standpipes/weirs 2'' below the water level would have 72x24x2/231=15 gallons max entering the overflows at one time, so you would be perfectly safe with a 30 gallon sump if the plumbing and flow rate are designed correctly.

 

[ogmoses]

FX5 and some UV