So I finally have a very efficient co2 distribution system going now. I have received two broken diffusers in the mail (thats what I get for going through ebay from malaysia...) But in becoming impatient I fixed one of the diffusers mixed a new batch and presto! the thing looks like it puts out as many bubbles as an airstone would! and they are so tiny. The only other problem is I still have not received my drop checker yet. So I was wondering what are the signs of a nightly ph crash? I want to be able to recognize it right away. If it becomes a problem I guess I will just drop an air stone right next to the diffuser at night? I would take it out but it makes an obnoxious noise.