I recently bought a koralin 1502 reactor. I got the Co2 filled up and got it running everything apeared to be alright i made minor adjustments every few days , but the problem came when after two weeks of us I ran out of Co2. Now I am using a 5lb Cos2 tank and from what I hear it should last me up to a year. My bubble count was about 15-20 bubbles per minute wich seems high now that I think about it But it doesn't sound high enough to deplete all that Co2. So i go in and talk to the guy at the weld shop and he tells me to check for leaks and what not and I get it filled again this time it only lasted me a week. Any suggestions on where the Co2 is going the guy at the shop checkied the bottle for leaks and it was alright. i think next i will try to get it filled up at a different store.