Hello, I'm not only a new member but I am also new to the underwater world. I have a 10gal tank with a red fin, and a zebra danio that I started about 3mo ago. I have had trouble for the past couple of wks fighting green water, looking for info I stumbled upon this gem of a site. My oldest daughter has a 3gal with a betta, thinking about giving her mine and upgrading to a 30gal. I also have 2 dogs and a cat.