I am shopping arround for a CO2 tank and regulator for a calcium reactor. I have a vew questions for those of you with experience with these. first, I found two brands of regulators with solinoid. the JBJ brand and the milwaukee brand. is one better than the other? the Jbj I found is actually a little cheaper. it is made in Germany. I am thinking of getting it but wanted to check in and see if it is a good quality reliable regulator. my next question is can steel CO2 tanks hold more CO2 or pressure than aluminum ones? didn't want to buy a aluminum one to find out it cant hold as much as the steel ones. any advice you could give would be greately appreciated. thanks.