I have two tanks, a small 6.5-gallon nano tank with two fish and I just set up a 20 gallon recently that has two young honey gouramis, a baby bristlenose pleco, and four glowlight tetras. Both tanks have live plants and the 20 gallon has a HOB filer and submerged multi-media corner filter. Both tanks have air stones. I am going to get a bigger tank, but wanted to get a 20 first. The big ones are kind of hard to manhandle around and I am an older woman in m my 50's who has some physical limitations. I need to figure out some way to move the big ones around. I am not new to aquarium fish. I had them growing up and in my teens, I even bred them, but one thing is for sure you can always keep learning more.