My alk tends to fluctuate up to +\- 1 dkh depending on what’s going on in the tank. I can have my alk stay a solid 8.4 for months at a time or swing high or low in the matter of a few days. I used to check once a month at water changes but had a bad experience with an unknown consumption change that spiked my alk and killed some coral. So now I check every few days to once a week and adjust my doser as needed. I go through alk test kits at a rate of one salifert kit every 3 months or so so I have an $11 refill set to auto order every 3 months. Just curious what others experience is.



