hi!
i recently got a new co2 set for my 1000 litre (240 gallon) aquarium. i addend a external solenoid to it to automate it, however, whenever i switch to solenoid off, the tubing behind it starts to expand a lot, kind of like a balloon about to burst( this happens within 1.5 minutes), is this normal, as i am scared to turn the valve off for more than a few minutes( which is kind of a waste). if it is not normal, is it possible to use the co2 without the solenoid ( maybe by running at a very low bubble rate for the whole day)