This is my first time posting, so forgive me if I make any social faux pas. I also posted this to the discus forum (but I figured you guys would know this stuff best).
I have a planted discus tank with CO2 injection. The CO2 regulator solenoid is hooked to a timer so it's on only in the daytime. Recently, my CO2 regulator has decided to free-flow. *Again* (happened once before). Unfortunately, this time it happened when I was out of town and when I returned, pH was around 5 and all my discus were dead.
After some experimentation, I discovered that the regulator seems to allow more air when the room temperature is *low*. This is the opposite of what I would expect if it were due to CO2 expansion in the tank. My guess is that the metal parts of the regulator are expanding/contracting with temperature swings of the room. The room is a south-west corner room so it goes from ~70-78 on a daily basis with occasional swings from 63-80+, if the weather is right (Bay Area summers). I must have set the regulator last on a hot day, so when the temp dropped, the regulator free-flowed.
I contacted the company (Milwaukee) but they haven't gotten back to me yet.
-Has anyone else have had this experience?
-Is a pH controller my only solution to this problem?
-Any recommendations to good reliable pH controllers?
Thanks for any and all advice!