Most LFS will have small gourami's just like yours for sale. You would just want a small tank, probably something like 40L upward. I kept an Opaline gourami in a hexagonal 60L (i think) with gravel, piece of bogwood with Anubias tied to. I gave him a slanted rock to lean against the side of the wood creating a small cave. I bought for him a female opaline gourami as company with a mini army of Japonica shrimp to keep the tank clean. It was quaint and i know he liked it.
Littlemonkey on this forum now has my male Opaline
I like how attatched you are to this fish and how you want to create him his own little tank Its how fish keeping should be. Kudo's to you
Aw poor little guy, how sweet of you! I can t advise as to the perfect tank but all the best wishes, I am sure he will appreciate a new home as his kingdom x
Built the Java Moss wall the other day, and guess who I later found with half his head wedged stuck in it...? Yep. Dumb! Had to unstick the suction cups and shake him loose! He now has a bit of a bruise on his head for his troubles