Help! used tank - does this mean no good?

[bmuckluck]

Okay so I bought a used tank. Its a 50 gallon rimless. I just went to fill it to leak test it today, I got a few inches of water in there and then noticed this corner didnt look right. Its holding the water fine so far but I didnt fill it up any higher yet just incase. Is this just a result of a silicone job or do you think the glass pane is fractured? It looked fine empty as far as I can remember.

 

[Donthemon]

Looks like silicone. I guess I would leak test outside or in the bathtub just to be sure if you are worried.

 

[SmearingsFish]

Yep, I agree with Donthemon. If there are leaks, you’d need to take of the old silicone, I believe. I’m pretty sure silicone doesn’t stick well to itself. Be sure to get fish safe silicone, though. You can get it online and maybe in some stores depending on where you live.
Good luck!

 

[My300]

Cannot say for certain but looks like silicone, not fracture. I would probably test fill out side so you don't risk a flood in house, just in case.