Best Betta tank ever, it has so much potential, take out the marbles and colored gravel IMO, and get some more natural stone/sand combination, add some plants in the Betta tank, and the moss on the outside Would be awesome.
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Yes I'm also planing to get a bit of sand and some algae covered rocks from my other glass tank and put on the bottom. I'll also try to get some anubias plant to go in the water. The moss should also be able to get a hold on the tank edges and with daily misting would grow nicely