sump size

[jft]

I am trying to fit a sump would a trigger 26 inch sapphire sump handle 125 gallon tank! or maybe their 20 inch cube? Please advise. Thanks!

 

[Cthulukelele]

I personally would want a lot more sump for a 125, but imo it really depends on what you're using your sump for.

If it's just to hold your fairly small skimmer and your heaters that will probably be just barely enough.

I personally have a skimmer, an oversized refugium, UV plumbing, and a co2 scrubber setup in my sump on a 120g tank in about 75 gallons of sump (~3x the size of your sump), and honestly if I could go bigger I would. It's really up to you though it could technically work.

 

[PharmrJohn]

I'd go bigger. A 20g sump for a 125g tank will raise 6+ inches in water volume for every inch lost in the 125. So it's taking a chance (overflow) if your return pump fails ya. I wouldn't go lower than 40g.

 

[BryanM]

IMO, as big as you can fit.