Since the addition of the Profilux controller I've been monitoring the pH cycle of the tank quite closely. I must admit that I just love this kind of thing, it's the scientist in me. I've noticed that the minimum value was lower when there were two of us working in the same room as the tank than when it was just me or even when there was no one in the room at all. When there were two of us working in there the pH would drop to below 8.0. I thus began thinking about adding a CO2 scrubber to my protein skimmer to see what difference it would make to the pH cycle.
There are a couple of scrubber options on the market (that I know of) and after brief consideration I decided to try the new ATI Carbo EX filter since I have used their ICP test recently and the price seemed quite reasonable. Connection to my skimmer was easy and I have it situated in the cupboard alongside the tank (next to my RO resevoir). It measures just under 21cm high and 10cm diameter for anybody interested in the dimensions.
As soon as the scrubber was connected I noticed that the tank pH began to rise, so it certainly appeared to be working. Frankly, I'm amazed that just breathing in the same room can have such an effect on the pH of a tank. I have drawn up a graph from two typical daily 24hr pH cycles, taken from 8am in the morning (when the lights switch on) to 8am the following morning. The green line shows data from the 15th of June (6 days before the fitting of the reactor, we were out of the house for half the day) and the blue line is from the 28th June (6 days after fitting the reactor, I was working in the same room for most of the day).
As you can see the pH before the scrubber fluctuates from a low of 8.03 to a high of 8.16 and with the scubber it cycles between 8.23 and 8.34. Obviously this is data sampled from just 2 days but from from my general observation, the pH is most certainly higher with the scrubber and interestingly the cycle has a slightly narrower maximum and minimum range. Will this have a positive impact on the general health of the tank? That's the important thing, watch this space for updates!
Hi, my name is Lisa and I live in Derby, UK. I am a self-confessed reefaholic!