Thanks guysI'm flattered! I'm still trying to sell the tank... I think I found the method on youtube.
It's super simple, I'll try to explain:
I cleaned out the empty tank as good as I could.
Then used expanding foam (great stuff from home Depot, comes in a spray bottle with a straw tip thing).
With the tank on its back, cover the background. Let that dry, then do the sides he same way, turning the tank so the side you're covering is down. The foam will run if you don't have the work site flat on the ground.
The shelves are made of a single 1" sheet of insulating foam cut out with a knife. I had to go back into the expanding foam with a knife to cut out slits to slide the shelves in but I think, it would be easier to press them into the foam when it's still wet.
Then just got a bucket of grout. I needed a 1gal bucket of ready grout for my 100gal tank. Used a paintbrush to paint it onto the foam.
Once that was dry I went over the parts where the grout cracked while it was drying.
Once it was mostly Crack free and dry, I sprayed it with grout sealer, and then with an acrylic sealer.
After everything inside is done, I spray painted the outside of the tank with blackboard spray paint because that yellow foam is not very pretty to look at from outside.
Since I'm selling mine, and building a new one (this time the entire tank from scratch) I could take pictures of the process for the new one. It'll be a couple if weeks still because I just finished the tank's blue print so I'll have to go in the shop and build it. It's going to be acrylic with this same background in it.
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