I'm thinking about getting a Ca reactor, but I want to know if the grade of CO2 (e.g. food grade) matters. I can get CO2 tank refills at a place that maintains fire extinguishers or from Airgas. I haven't found a local beverage supply company that sells to anybody but businesses. Is the fire extinguisher/Airgas CO2 safe to use in a reef?
Also trying to figure bottle size (I would like get as small as possible but don't want to have to get refilled every month). My actual tank volume is estimated at around 130 gallons (tank is 6' x 2' x 19" plus a sump). It isn't heavily stocked with LPS and SPS right now, but my LPS and SPS corals are growing, and I am still adding. I also plan to continue dosing kalk, mainly to help keep pH up, and estimate I will dose 60% - 75% of total top-off required. Any thoughts on how long a 5lb bottle might last me?
Also trying to figure bottle size (I would like get as small as possible but don't want to have to get refilled every month). My actual tank volume is estimated at around 130 gallons (tank is 6' x 2' x 19" plus a sump). It isn't heavily stocked with LPS and SPS right now, but my LPS and SPS corals are growing, and I am still adding. I also plan to continue dosing kalk, mainly to help keep pH up, and estimate I will dose 60% - 75% of total top-off required. Any thoughts on how long a 5lb bottle might last me?