3/4" Plywood "access panel." This is the same cut-out from the front panel of the cabinet. This will be held in place with cabinet door magnets, allowing complete removal when needec.
Chair rail trim around the access panel, to hide the seam.
Pine stop trim around the tank cut-out.
Completed cabinet.
With Perfecto 90g Corner-Flo tank.
Back cover (1/8" paneling, to block light).