Not good I can tell you that.
Any bubbles, glass or acrylic, in the joint will tend to seperate over time.
What's the size of the tank?
IMO it's a ticking time bomb.
If you wanna take a chance take pics every week of the seams with air and see if it get worse.
Remember if the air pockets get bigger you already are to late.
Some ppl will say it's the inside corner seam that keeps the tank together well partly true but it's the whole seam that works.