I hope this helps. I bought an Aquacrylics filter and overflow box. The overflow is 3.25" and I'll bet if you were to contact them they could get it down the amount you need. Quality is excellent and they are great to deal with let alone there prices are nice too...
I have the Remora Aqua C and it pulls tons of stuff out daily. So much so that I bought the Auto Waste Collector they sell. I also run an Ehiem canister which keeps the water pretty clear along with the LR and LS
Good luck
Seaslug
