I was thinking of getting a drop checker so i would know if my co2 level was correct and i ran accross the red sea co2 indicator. i am a bit sceptical about the quality and was wondering if anyone had any experience with it or any unput. thanks. here is a link to the red sea co2 reactor. at bigals http://www.bigalsonline.com/BigAlsUS/ctl3684/cp18478/si1380875/cl0/redseaco2indicator