What should I do with this spare vessel

[RamsReef]

Hello,

When I built my sump I made a 14" wide x 33" deep x 22" tall box that I was going to use for water changes.

I dont want to do that now. I dont have good access to it and would like to put something I dont touch, AT ALL.

It will not be lit, no refugium


What would you put in here?

Deep sand, water in at bottom, bubble up to top?


Media Bricks

Rock

Nothing

Let me know your thoughts.

Ram

 

[exnisstech]

If it's going to be attached to your tank you could fill it up with rock and run a cryptic zone.

 

[RamsReef]

Sounds good, I already have a cryptic zone but whats one more lol. Hownwould you do it? Sand, rock, rock size?