wanted to say Hi

[KevinK]

Put wedges under your stand! Not the tank otherwise you end up with a real crack

Once level, even with one wedge, add more to spread the load, as your floor could give in a tiny bit.

[reefwars]

Most likely that would be 10mm or roughly 3/8" thick glass ,1" glass is rare and for aquariums 25x your size , that tiny chip should be fine from what the pic tells but like most things in life there's never a guarantee

Oh and yes level stand not the tank , the tank is only as level as the stand which is only as level as the floor and so forth , floors are often off level over time

Welcome and keep us updated with pics

[Reefmaster]

If I could suggest - be careful even trying to shim stand unless you are sure the stand is quite rigid and/or you have foam under tank.