http://www.marinedepot.com/aquarium_...rip_holder.asp
This seems like a really great idea... I am having trouble with suction cups failing, and I was considering getting these. However, at $25 a piece, I am having a hard time justifying the expense. I thought it might be a fairly easy DIY project but I was wondering if it would be okay to have an exposed magnet inside the tank. Would I need to cover it to prevent some kind of reaction with the saltwater?