http://www.reefcentral.com/forums/showthread.php?t=2360126
BE VERY VERY VERY careful with these magnets though. They are no joke.
I have 6 on my 1" acrylic tank. 2 holding WP60s and 4 holding WP40s.
I actually covered all sides on the magnets that aren't against the acrylic with black duct tape and bubble wrap to make them a bit safer. Then covered the side against the acrylic with one layer of black duct tape.
If you order multiple magnets, ask they are wrapped / shipped individually. Trying to get them off of each other in a block separated by spacers (normal way of shipping multiples) is just dangerous to people not familiar with these kinds of magnets (me). I broke one trying to get them off and shipped the back to be sent back to me separated.
Which magnets did you end up with, 48's or 50's? Thanks,---Rick