Sump Size?

[schooly20]

How big of a sump would you need for at 90 gallon freshwater tank?

 

[rabbut]

You want one at least able to hold 25% of the tanks volume, so 22.5g. One capable of 50% would be better, so 45g would be where I'd look

 

[mike os]

20% or larger... bigger is always better