You’d need to protect the bottom glass, a route would be setting in place a starboard piece the size of the bottom or a piece of thick glass siliconed (floating glass).
Long ago, Jason
@Eight ? Bought a tank from Ron, fellow reefer that had a starboard bottom carved to mimic a sandy bottom, I believe epoxy and sand were used on top of the starboard piece.
Some people have used Great Stuff for ponds to put rock pieces together, not sure of how strong the bond would be and less sure about anything leaching in a saltwater environment while using that material.
At one point I had started to work on a wall tank, 36” in height but gave up un that idea since the sump cabinet height derailed the project; I like higher cabinets that can accommodate equipment and are easy to work inside.
Circulation was a big issue, I don’t think MP40’s we’re already on the market
Another issue was light penetration, back then halides were the only choice to get down the water column and directing light to an almost vertical set up… Just scrapped the plan.