tank levelling issue

[The Grizz]

Is the tank full of water??

First thing I would do is check the level of the floor around the tank, if it is a good quality laminate it will not compress more then a couple mm. It could be be that the floor is just a little off.

Second double check the joist to insure they are not deflecting by measuring from one end to the other ever couple feet. Make sure that you can measure down to a level surface if your basement floor is not perfectly level.

Third check your stand for level and if it has feet on the corners of it I would shim up the corner that is unlevel.

But I am sure it will be fine the way it is but if you are concerned check and double check until you are happy with it.

Just things I would do because that is just me