55 gallon reseal/recaulk

see the spot with no silicone..

..there is still something holding it together between the pieces of glass?
and if i use rtv 108 (i will, unless someone has another alternative) i would caulk it just like how you would caulk a window or a bathtub? (smooth bead, flatten it nicely with wet finger...kind of like the caulking directly above the spot with none)

if what i am proposing won't work i will sell it as a snake tank, to subsidize the cost of a new tank

Around here I buy GH silicone I, for windows and doors. It is 100% silicone, and has no mold inhibitors. I have heard the Kitchen and Bath version does have mold inhibitors.
I also have some of the RTV product, but have yet to use it.

Tanks that I have repaired have all failed but 1. I suspect that there is an invisible trace of old silicone that is preventing the new silicone from properly bonding with the glass.

I have tried cleaning them with rubbing alcohol and this did not help.

Most of the repairs held up for about a month, then gave way slowly, a pin-prick sort of leak that just seeped at first, then got worse.

The only tank that made it is a 15 gallon (actually holds about 12 gallons) that is quite shallow, so there is much less weight of water forcing the glass apart.
Tanks that have failed:
125- sold it for a snake habitat.
45 gallon that is 2' tall- Carnivorous plant habitat. It holds 6" of water safely.
24 gallon hexagon- Another terrarium sort of set up, it also holds about 6-8" of water.

Current project: A 45 gallon tank with a broken end glass. I am going to try one of those silicone caulk removers and see if that will really remove the remaining silicone after I have razor bladed it off.