Outer Limits 4x4 Board

Im attempting to put my lux tank between the chassis rails. It only needs about 3mm trimmed off it lenghtways to get it in there. Just wondering if theres anything I should worry about. The lip is about an inch wide and the mounting holes are between the edge I have to trim and the tank itself so I dont think I'd have any problems with causing leaks. It's been sitting empty for the last 2 years anyway.

sounds like it should be all good if the holes are between the edge and the tank then 3mm shoul be o.k

Can you bend the excess lip out of the way with a pair of multi grips