Foam/ Rock back wall

The back wall is holding up great. It's been on for quite some time now and I still enjoy it. Adds a lot to the tank.

 
Oh my gosh this is amazing! I LOVE your background! I joined today to get help for my FW sump but have always wanted a SW tank and you are giving me massive tank envy.
Was the Z poxy only used to adhere the crushed coral or is the foam not fish safe? I've made backgrounds before (only for FW though) and the most tedious part I found was the need to seal every inch of foam or risk killing everything because I couldn't find a fish safe foam. I always struggled to find the most cost effective way of sealing it.
 
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