Not enough info to even comment. Looks bad anyhow.

What information should I provide to you so that you can kindly make a comment?

Give us a cross section showing footings to scale, the tank and complete soil information to depths at least as deep as three times footing widths (density (SPT),water conditions, etc). Photos would help, if possible. Loads on footings and resulting soil bearing pressure. Where data is not available, at least estimates. When did settlement occur and how related to tank history or other site history. What is the area geologically speaking. Area ground water table situation and history here. Even so this may not be enough

While you are compiling info, comment on what is gong on to minimize the problem. Where do you stand? Working for owner? a contractor doing this? who decided to do it?

What material is the tank made of and how long has it been there? With that much settlement in close proximity to the tank, you might have soil raveling into the tank, assuming the tank bottom is below the footing.

As OG noted, a cross section with dimensions would be helpful.

Assuming you wish to correct this, detailed site information definitely is needed. It won't be easy.

Is the tank existing? I thought OP was asking if a tank could be installed.

for the hypothetical, the answer is, "Yes." Now something depends on budget!

f-d

ípapß gordo ainÆt no madre flaca!