I have a 40 breeder with a 20 gallon long sump!
I’m running an eShopps overflow box (medium).
The sump was setup using the Fuji Cube sump kit, which turned out nice and is functioning well.
There is a Bubble Magus Curve 5 for the protein skimmer which flows down to my Jeabao return pump.
So far, this setup is running nicely. No complaints.
Soon to add a refugium, as there is dedicated space for it in the sump and I already have a light for the algae.
Currently running two AI Prime 16s for the lighting.
Again, running smooth so far but only at about 3 months.