Cute pics! I can't keep fish in my house - tried it once, & came home to an empty fish bowl & four innocent 'who, me?' faces, even though I had a mesh lid on it to protect the little guy.
I had a beautiful blue betta, and no fish in my aquarium, so I dropped him in for him to have to himself, and he grew huge. Apparently it is possible for them to grow to the size of their environment. He got so big and pretty, almost the size of my hand with all his flowing fins. Then I found out you can put them in an aquarium with other fish as long as they do not have flowing fins. I threw some mollies in with him, and he never bothered them.