how level is your water?

Mine is like half an inch difference, which is pretty dodgy I gather; but I'm moving soon so I don't care lol

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none of mine are perfectly level but none are off my more than an 8th of an inch so I leave them be

Depends on the size tank ect. If you have a lopsided 10 gallon the maximum water weight is going to be 85lbs or so......nothing to worry about but if you have 100+ gallons of water with 850+lbs of water weight not being level isn't an option for very long........most tanks are designed to have all that weight equilized and should be as level as possible.......too much pressure on any side can eventually cause cracking and other issues

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None of my tanks are perfectly level, all of them lean slightly one way or the other & have for years - tanks are 100+ gallons. I explained why this is not an issue, as well as when it can be and why, in the following past discussion.

http://www.monsterfishkeepers.com/f...965-Slight-unleveled-bout-to-pull-my-hair-out


HTH

My 225 gallon was about 1" lower on one side for about 4 years (before I moved the aquarium), and I didn't have any issues with it in that time.

Not many floors are completely level. If your fidh room is in a basement the floor is going to go towards a floor drain. My fish room is completely level. I had it poured that way. I have tanks in the house that are a 1/4" or so off. After 60 years there is going to be settling to a foundation. I had a rental house that was so bad if you dropped a pen you had to chase it.

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I'm certainly no expert, all I can say is that if there torsional twist across the corners, causing stress on the glass, there is risk of the glass cracking. Usually when that happens it's in a BIG way.