Lately, my once thriving zoos are starting to melt away. I notice full plugs losing polyps. My kalk for topoff has not been able to keep up and I have been manually dosing, but I find that each night I test, my alk swings a bit. I ordered dosing pumps and will be setting up soon. I just hope this helps. My sps are showing signs of stress. The zoos were fine for quite some time; they too, now, are deteriorating.