I just did my freshwater fill to check for leaks in my 150 Gal. I am using a 40 gal. Rubbermaid tote for a sump for budget reasons. So far everything has gone well. No leaks!!!!! I was wondering if I can put my heaters in the sump or is that a bad idea due to the plastic? Right now I have them in the tank, but I would rather have them in the sump.