hi, i am using the old kinda fish tank ... no build in overflow. currently using 2 pumps to pump water in and out of the sump. i was wondering this overflow pipes.. they do need a regulatory valve to control water flow right ? as in like so the amount of water going in and out will be the same. correct me if i am wrong ..
please enlightenment me haha ... my two pumps giving me a headache ... have to adjust of the valve every once in a while ..