How to get gsp on back

I got a magnetic frag plug that I attached the gsp to then placed it on whatever wall I wanted it and it would grow off the plug onto the wall.

I just bought these my problem is I run in aio tank and I want them on backwall so the problem is they are underwater.... I'm nervous about this anyone chime in. Thanks
 
Magents are convenient, but I try to minimize magnets in the tank. I’ve had several frag rack magnets rust before.
 
I just bought these my problem is I run in aio tank and I want them on backwall so the problem is they are underwater.... I'm nervous about this anyone chime in. Thanks

You can buy reef safe magnets. Just search on reef2reef and you will find a few threads. I think I bought some from kjmagnetics.com.
 
Mine is a branching type and made the jump all by itself. I'm scraping it weekly at the top so it doesn't obstruct the overflow.
 

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