So I have a new tank which has been cycled for 2 weeks with one torch only, I added a rock with GSP and a rock with Zoas yesterday. Today I checked the alkalinity with Salifert test kit and the result was 4.5dkh. It was so low that I had to test again to be sure but the result was still the same. I cannot understand how the alkalinity would drop so significantly even though I have so few corals. A few days ago alk was about 8dkh. What is wrong and what should I do about it? My corals are still looking healthy and happy but Im thinking about a quick water change to bring up the alk.
Salt mix: Aquaforest sea salt, which is advertised to have 8.3-8.9dkh at 1026sg. Current salinity: 1025sg
Salt mix: Aquaforest sea salt, which is advertised to have 8.3-8.9dkh at 1026sg. Current salinity: 1025sg