I don't think the tank being unlevel would cause this unless it was off by a lot. I just put a tank up that was perfectly level but was I filled the 20 gallon under it the tank is off by about 1/4 in which ill fish during my next water change.
Other things that could have caused it could be a heavy decoration putting pressure on ur stones which caused the glass to crack.
Sent from my LGL55C using MonsterAquariaNetwork App
Other things that could have caused it could be a heavy decoration putting pressure on ur stones which caused the glass to crack.
Sent from my LGL55C using MonsterAquariaNetwork App