AC110 of any use?

[SoggyNW]

I was going through boxes in the garage and found a pair of AC110 HOB filters from a freshwater tank I had years ago. Is there any use for them on a reef setup? I have a 40b with a 20 gallon sump. Maybe for temporary carbon filtering? Or I can sell them and buy something useful.

 

[Blue Ring Octopus]

One of them would be perfect on your 40, look at In Tank for mods for it.

 

[Eggs]

Probably wouldn’t hurt to hold on to one, as you said carbon if needed and some other oddball issues that may come up.
I once added some fine sand to a tank resulting in too much floating in the water column. Ended up using a hob with some filter material to pull out what didn’t want to settle to clear up the tank.