Yup I check it out today after couple days of playing all kind of setting with it, and found the back magnet not even that warm. The MP20 I have had a little plastic that I put between the glass and and the dry pump so I dont think it can transfer any heat to the tank. I set my at 70%, if I go for 100% all the debrish on top of my sand would fly all over my tank :-)
Yup, after I had run the vortech and loving it. I did more search about it and found out their new product is MP10, it's smaller and have very much the same flow as the MP20. I am thinking about getting one for my tank.