tank unlevel

[oba971]

I have a 90gallon that seemd to be level (bubble between two lines on level). After I filled it with water and
sand/rock it now is about 1/4" off from left to right (over a 48" span). I have read both opinions that you should
put shims under the stand and that a little off level wont be a problem. My thought is that if a company buit a
tank that has to be perfect or it will break there would be an a lot of people with wet floors. I understand that
it would be ideal for 100% level but is it realistic/neccessary. I should mention that the tank is in the basement
on carpet.
Just looking for some opinions.

 

[flower]

Welcome to the site!
It is important that the tank be level, very slight difference is no big deal but 1/4th is too much, it puts way too much stress on one side to be safe.
I also have a 48" 90g and 1/4th off the top is allot of water
Just my .02

 

[scsinet]

It's one of those things where you may never have a problem, but you need to ask yourself if it's worth it to leave it as is and risk a failure later.
Tank failure is one of the most catastrophic things that can happen to a system... consider that if it happens, not only are you making a gawdawful mess of your house, but even if you catch it early, you probably don't have any place to put rescued livestock.
1/4" over 48" is significant, but it not so significant that I could predict failure with certainty. If you are on a concrete slab it probably won't get any worse.
If it were me, in this situation where you haven't started stocking yet, I'd level it.

 

[oba971]

We'll I think I got the tank level. I shimed the bottom of the stand. According to my level it looks good but I swear sometimes the water looks a little off then the next it looks good. Maybe it's just me being parinoid about the possibility of 90gallons of watter sitting on my basement carpet.