Hmm okay. First fish in will probably be my girlfriends 3 fantails she got from her grandparents with a 4 gallon. I'm still seeing when I can get a bichir inPerfecto ! Qt doesnt have to be fancy just allow you to accomplish what ever you feel you need to before putting a fish in the main tank. Infact i would remove the little pipe too. Will be easier for you to observe the fish.