Cutting 20 gallon tank in half.

[AdamsB]

So I've got my 90 gallon SW set up, an now I'm in the market for a quarantine tank. I'm limited for space though and with my girlfriend moving in I can't just put a tank wherever I want like I have been doing

So I have an old 20 gallon kicking round and I'm in a basement suite with a 6 inch shelf along one wall beside my 90 gallon. So my plan is to cut my 20 gallon in half, reducing it from a 12 inch width to 6 inches. Giving me close to 10 gallons and allowing me to position the tank where I need it.

The plan. To seperate the tank and clean all the glass. Ill then cut the 2 sides to the desired width along with the bottom. Silicone them back together and possibly use scrap glass to make a centre brace.

My concerns. I'm just unsure if the bottom is tempered. It's a tetra brand and I tried googling with no success. I found that the 15 gallon isn't tempered. But If I have to buy a piece to suite that's fine. Do I need a centre brace or would the tank hold ok by itself being rimless? I've used type 1 silicone to fix up tanks before but was suggested not to use it to construct a tank. Would it be fine for this size?

Just like my 90 gallon it was my first time drilling glass, thi will be my first time cutting glass and building an aquarium.

Any and all advice accepted