My 90g has been up and running for about 10 months now, and I think that 15g water changes with ReefCrystals twice a month aren't able to keep up with calcium demands anymore. Elos CA test kit shows 330ppm, and Elos Alk shows 5.5dkh. I'm going to eventually set up a drip, as shown here, but first I need to find out how much my tank uses. What's a good starting point?
I had a 700ml water bottle handy, so I used 1/4 teaspoon of kalk. I then made 6 marks on the bottle. This way, I add ~100ml per day of the solution (every couple hours when I'm home I add some till I reach the next mark). Does this sound reasonable? Or is that amount way too small to make any difference in CA and Alk readings?
I had a 700ml water bottle handy, so I used 1/4 teaspoon of kalk. I then made 6 marks on the bottle. This way, I add ~100ml per day of the solution (every couple hours when I'm home I add some till I reach the next mark). Does this sound reasonable? Or is that amount way too small to make any difference in CA and Alk readings?