I have just installed this tank it is a 230 litre tank when I set it up it was level and after I have put the water in it has a slight lean back to front.
I am just wanting to know if this is ok or do I need to shim it?
As long as the tank is fully supported on its base, ie the cabinet isnt twisted then it should be ok. Shimming the cabinet would be the best option however, especially if you have concerns.