Really amazing, it's good to see that this tank is still there, even after the contest.
Could you tell me how do you monitor your CO2 in this tank? PH drop, drop checker (which color), bubble counter? (I would like to know how CO2 level is critical with your fert).
Always love seeing this tank Do you have a full list of all the stock you have in it? Just for reference, because I know you mentioned somewhere that its a lot, but it never seems very crowded, just a nice bustle of activity.