Yep. People tend to not like saltwater on their cabinet floor, or carpeting / tile. You could put a thin bead of silicone between the impellar cover and motor, but not too much or it may ooze into the area and stop the impellar from spinning freely.
do you have any suggestions on another pump for my sump that does not put out so much heat? said:
The only mag I use now is to mix saltwater, even then if I put a cover over my saltwatert container the mag 12 heats the water to over 90*. I recommend Eheim pumps.
I had a Mag 3 then Mag 5 externally plumbed on my Seahorse tank for about a year - no problems. The only problem I ever had is if I cleaned it and then didn't quite get the seals set right, they'd leak. Easy fix though, I would took it apart and be a little more careful putting it back together again!
I have a Mag 12 on my 90 now plumbed in the sump and my tank is running a little warmer than I would like, and I only have PC lighting. My tank temperature hit almost 83.5 the other day with a fan blowing on the sump. I wired up my in hood fans that evening and that seems to have really helped. Yesterday I don't think the tank got over 80.8 which I consider very good since my A/C wasn't being super effective yesterday and the house temp was at about 77-78.
No arguing that Eheims are great pumps but they are also a bit pricey. I considered Eheims when setting up my current tank since my Mags were sold with my old tank but started reading about Ocean Runner pumps. I am now using an OR 3500 on my return (submerged) and OR 6500 on my closed loop and really like them. They are quiet run cool. I think they are worth considering. http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=14677&N=2004+113041
