Hello everyone, I recently purchased a MP40 but sadly it does not want to hold against my aquarium’s glass which is 1/2” thick but the spacers provided with the unit suggest that it should work for the thickness I have. The spacers provided are for 1/4, 1/2 and one that suggest usage for thickness above 1/2” so why can’t I get it to stay put? Has anyone ever had this issue? Is there a way to resolve it or should I go for the MP60? Tank size is 120g FT which is 55” across