May consider building a acrylic sump....
Here is a pic of a sump I built out of 1/4" cell cast acrylic (+28 operational gallons) .
I used left over acrylic to make side bracing even though the eurobracing and the acrylic partition was more than enough to keep it from bowing.
I wanted to maximize all the space under the 40B display tank. It has 2 durso'd gravity feed drains one goes to a trickle tower with 3 gallon of wet-dri media and the other goes to a micron sock/ carbon media chamber. both are a breeze to maintian.
the other pic is a diy sump using a 2gallon bucket (1.5gallon wetdri media) held in place by a siliconed glass partition and 10G tank rim. it has mangrove pods, heater, almond leaves in the back and I diy hood powering a 3x3w led bulb.
its not dificult to weldon arcylic panes together.
look up UaruJoey
on youtube or better yet--->
This man is brilliant!