Hahahaha Juan you crack me up. I would not use that on a 3g tank. Too much can go wrong when your are increasing ORP with that. I would suggest getting a wood air stone with a 10g air pump and run it for 20 min at night. it will do the micro bubble thing and not risk spiking your ORP to dangerous levels. Also, don't use this method if you do not have a skimmer.