Quick Quick. Shimming Sump Directly? Was Unlevel.

[CBBP]

SO I used a 55 gallon as a sump. The problem is while the tank and stand shelves are level for the main tank the sump is not. it is off but more than 1/8"

So I used shims directly under the tank and its foam. Is that safe? should I shim the whole outline or the sump tank??

 

[Rooster]

NEVER shim under the tank.... you need to get the top of the stand level, maybe shim the feet ?