Cracked tank?

[Brent F]

Is the tank full? If it isn't setup yet you can drain it and inspect it. It could be a crack, a scratch, or in the wood. One thing you could do is reach in and see if you can feel it. If you can't feel a ridge it is most likely a scratch or in the wood.

If it is a crack it will fail under pressure. If the botton glass is cracked the only option is to replace the bottom glass or the whole tank.