You have a couple of options, you silicone the area that you are going to gs and then apply the gs or you can a frame or support the size you want and create your bg outside of the tank and then silicone it in. I'm sure there are a hundred different ways you could do it. I believe applying the silicone to the area before the gs is the most common. Personally I just use coir matting that you can get at most nursery's or I don't mess with a bg.
Personally, I use foam on the eggcrate and make my entire background outside of the tank.
I do not attach it by any means when I put it in the tank, I just put it in. I'm pretty careful on my measurements and its usually pretty snug, and that way I can remove it later without headache
The only issue I have run into is that the upper portions of the wall will sometimes lean forward a little. I solve this by simply using a wood feature that is either large enough or leaned up appropriately to prop the wall in place.
I guess worst case scenario, I'd probably use a little clay to secure the top so that removing it would still be easy later.
I don't like permanently affixing to my tanks as they always end up changing at some point or another
I used the red can for most of my builds. I just gs right to the glass(red can). The black foams dont bond well to glass. I did one build pond and stone gs and it came off after awhile. However I was watching one of grimms youtube videos and he had mentioned siliconing the glass if you are going to use the black foam. I just finished a build with black foam and I did silicone the glass before adding the foam.
I am planning on makeing tree roots from pvc and rope attached to eggcrate with gs.Then cut any excess gs from the back to make it flat, then spread silicone on the area where the piece will go.It will a total of 6 pieces,4 on the back and one on each end.
I never tried it with the sheets on it mine always came without them although I always went to craft stores to get them. I'd say try a small corner and see if it sticks or if it slides down when you apply some pressure to it
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