Even counting betta tanks I can't compete with some of you. But if you were talking about number of tanks per square foot of house, I might be in the running as I live in a rather small place and these tanks have infiltrated every room except the bathroom. I even have a 5 gallon on my kitchen counter. There would be some real problems if I ever fell in lust and wanted to move someone in. I guess she would have to be a mermaid.