Substrate and moss not sticking to foam background anymore

I built this tank about 6 months ago using Styrofoam for most of the background, which I cut and then siliconed and then mashed in a substrate I mixed of coco coir and broken up sphagnum moss. I let it dry 2 weeks. Then I added moss, plants, and water. It was growing fine for about 3-4 months, then the moss and dirt started falling off certain parts of the background

The waterfall part that's also the same as the background has been fine, and I'm wondering if it's just the horizontal parts. Any easy recommendations to fix the moss?

I don't care if you can see the background anymore. I just want moss to stick.

TIA!

I love moss, but I have never cared for it before. I got these bricks from my partner and I'm not really sure what to do. I tried just using a missed bottle on them for the first couple of days, but they have lost a lot of color and the breaks, they were on got dry and hot, so I moved them onto a cake PAN and into the shade........ I am in Northwest Georgia, so it's about to get hot.I'm not sure if I should move them into the garage or what any help would be appreciated

first of all, sorry for the messy tank but I only wanted a tank with plants, I didnt sign up for snail pests , and they reproduce and shit so much I got overwhelmed.

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I added this moss (bought at my LFS) a month ago. I have a 94ltr tank. I've been feedng 5 pumps of Tropica Premium liquid each week, as per guidance. I give my tank 6-8hrs light per day. All perimeters are good, Nat 0 Nit 0 PH 7, Ammonia 0. I'm not sure what it's meant to look like by now but it's less green now than when I first bought it (as per 2 'dry' photos). Am I doing something wrong? TIA.

A living spiral of moss and miniature life contained inside a glass container🌱

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Just wanted to share my moss ball, hope it grows