Sump for a 125 gallon.

[SanguinesDream]

What size of a sump is recomended for a 125 gallon?

[SanguinesDream]

I'm looking to upgrade and I am new to sumps from canister filters. Any input is appreciated.

[monkE]

canister filters are always rated to a tank size... so that is easy, though always find one rated above your tank. My 125 had an eheim pro3 2080 running on it.

As far as a sump goes, i think the rule of thumb is: as big as you can fit under the tank. I don't think you can over-do a sump. More water the merrier. I would say for that size tank, 30-50 gallon minimum but other than that you could go as large as you want.

Im far from an expert so maybe others will correct this post but thats how i would look at it if i was putting a sump on my 125

[daplatapus]

Yup, bigger is better IMHO. I've got a 150 gal sump on my 77 gal DT

[dino]

no set rule but 50 percent your main tank is always nice. also keep in mind your baffle height will determine how much water is in the sump also

[Alberta-newb]

As said before, the bigger the better! At a minimum, you need enough volume that in the event your return pump shuts off (power failure, pump fail..etc.) that the sump doesn't overflow.