You mean a tank with internal glass bracing? I would have to know the dimensions to be able to jugde if it would fit.
I'll check the max width the aquafuge will span when I go into the store this evening. Modifying it would be diffucult - the intake and exhaust are both molded pieces made by CPR, not standard PVC.
O.K., looks like either some modifications, or no AquaFuge for you.
The maximum span the AquaFuge will fit over is a hair under 2". It's actually more than 1-15/16", so I literally mean "a hair." No where near 3-1/4" though.
You might try wetdryfilter.com. I think they just started manufacturing something similar and they'll do custom builds. Its a bit more than the CPR one, but they can probably modify the design for you pretty easy.