Wow...did I read it right? You have a 400 liter tank? No wonder your hubby bans you from having more fish lol I am a diver, so I enjoy seeing fishes in the "aquarium" nature has to offer and I can't imagine taking care of a 100 gal tank!
OFL, our super moderator here is also a natural aquarist. I like reading her advice and suggestions and also learn something new from the members here everyday
I don't think you need the water bubble, it's nice to have but not necessary. I know, these little guys are so resilient with interesting personalities and all gorgeous! If I could have my ways, I would have a houseful of them, but my hubby said enough is enough
(Not sure why he is giving his opinion, since I am the one who takes care of them all lol)