With any tank, but in particular large tanks, they must be set up on a level surface. Almost any non level point will provide stress that, over time, will produce a strain on the tank that can eventually lead to a leak or even a crack. However, most tanks can take an eighth inch higher or lower corner and still not have a problem. In other words the bottom can have an eighth inch deviation in one corner when empty (big enough to put a wood ruler under that corner) but flattens out when filled with water, and yet never leaks in 10 years. I have at least three such tanks that are about 30 gallon size.
So use a level when setting up your stand to be sure the thing is level.
One thing you can do to help make sure there is minimum stress on the tank is to place a section of insulating foam cut to size under the tank. This building or insulating foam is about a half inch in thickness and is available at Lowe's and other hardware stores.
One other thing is that glass is a material that is cut by scratching it and then applying pressure to cause it to break at the scratch. If you have stress on the tank and it gets scratched (inside or out) by a stone or rock or even gravel, it can lead to a crack in the glass that can leak or worse.
So use a level when setting up your stand to be sure the thing is level.
One thing you can do to help make sure there is minimum stress on the tank is to place a section of insulating foam cut to size under the tank. This building or insulating foam is about a half inch in thickness and is available at Lowe's and other hardware stores.
One other thing is that glass is a material that is cut by scratching it and then applying pressure to cause it to break at the scratch. If you have stress on the tank and it gets scratched (inside or out) by a stone or rock or even gravel, it can lead to a crack in the glass that can leak or worse.
