Eww that rule should be burned lol,hey : victory:
your tank is just under 15gal so you can have roughly 15" of small fish.
really? :devil: at my lfs the neons are usually pale and have quite a few dead fish in the tank, but the cardinals look fantastic.IME Cardinals are not a good fish for beginners, I would always advice Neons over them. I'm having troubles getting hold of good cardinals at the moment but neons are fantastic.