Fun little tank update! I added some stones to make it look prettier, a live plant, and about a week ago I got 3 black neon tetras! Azul hasn’t had any issues with them, they got along immediately after introduction. :)
Also I got a better functioning filter, I was tired of having to do water changes every 2 or 3 days because my other one was garbage.
That’s a lovely tank…but, 1: I’d suggest removing the squidward house. I had the spongebob house in a tank and it leached metals into the water and killed my fish within a month, and I wouldn’t doubt that that one may do that too. 2: black neon tetras love to have space to swim, and would do much better in a larger tank. Your betta would be perfectly happy on his own