this is pretty cool looking

li
I posted about my fish trying to have babies before lol 
I couldnt figure out why he had bubbles in his tank and then realized it's a nest. He started this last night after a partial water change. He's like "stop fucking up my house!" 😂 
It's cool looking. He's in a 3 gallon tank and I'm looking at a 5 gallon for him soon. Apparently the bubble nests mean they're happy and healthy.  Should I keep him in 3 gallons if he's already happy and feels at home? I got some info from you guys about this last time so that's why I'm asking. I was told 5 gallons is the minimum for beta fish. But if he's happy then? I know the tank looks small by this picture but I promise you it's 3 gallons and I can't lift it. I have to have my SO do it for me so I can do water changes because I'm a pansie.