I have read thoroughly the Ganoksin article on etching at
It shows the fish tank pump and does not show any tubing. Some are
electric and some are battery. The clerks at petsmart said there is
NO vibration from the pump itself. It only moves water by pumping air
bubbles into the water (of a fish tank). So, do you use tubing? In
the ferric acid? And is battery or electric better?
Can someone clarify, please?