# Can someone help me understand this?

I don’t understand but it seems super important and relevant, especially to me!

What is meant by a tank leaning diagonally? My understanding is if a tank leans to one side, then the corresponding diagonal corners must be uneven?

mattgirl
This may not be what he means but I can see a tank experiencing a diagonal twist if the stand isn't built correctly and the back left corner and the front right corner are lower than the front left corner and the back left corner. This could put stress on the glass once the tank is filled and could cause a failure.

This may not be what he means but I can see a tank experiencing a diagonal twist if the stand isn't built correctly and the back left corner and the front right corner are lower than the front left corner and the back left corner. This could put stress on the glass once the tank is filled and could cause a failure.
Firstly, thank you for taking your time to go through that, it’s certainly puzzled me!

After rewatching, my understanding is that diagonal corners of the tank can not be uneven, but the tank can consistently lean back, forward or to one side. Therefore, the front left has to match the back right.

However, this does not make sense to me. If the front left corner is higher than the front right, then by default the back right cannot be the same as the front left corner.

Am I correct or am I missing something?

Once again, thank you!

mattgirl
As long as it isn't extreme I have to think a tank can lean forward, backward or to the left or right, thus not level. My big tank sits a tiny bit higher in the back and a tiny bit higher on the left side. I am just talking about a fraction of an inch either way. It is sitting on a perfectly flat surface though so is not twisted. Diagonal stress can only be caused if the top of the stand the tank is sitting on isn't perfectly flat. The stand may or may not be level but if it isn't perfectly flat problems can happen.

As long as it isn't extreme I have to think a tank can lean forward, backward or to the left or right, thus not level. My big tank sits a tiny bit higher in the back and a tiny bit higher on the left side. I am just talking about a fraction of an inch either way. It is sitting on a perfectly flat surface though so is not twisted. Diagonal stress can only be caused if the top of the stand the tank is sitting on isn't perfectly flat. The stand may or may not be level but if it isn't perfectly flat problems can happen.
What would you consider extreme? 1 inch?

I didn’t know diagonal twisting only occurs if the surface the tank sits on is unlevel! Is this the same for general twisting?

This leads me to think shimming the bottom of a stand can actually be more detrimental if the tank isn’t extremely unlevel.

mattgirl
To me 1 inch would be extreme. I can live with my less than 1/4 inch but I would be nervous with any more than that.

I suppose it could be called general twisting. Best to just not do it.

Shimming the stand will work, Shimming the tank not such a good idea.

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