Im not talking about any known nuisance algae. I'm just talking about a yellow film that develops daily that im constantly scraping off. My nitrates and phosphates are both 0. I tested it yesterday. My kh is 8. My pH Is between 8 & 8.5. My calcium is only 340 but I'm working on getting it up using aqua vitro calcification. I also use aqua vitro 8.4 which has gotten me kh and pH right on spot in a little over a week. I have no idea what's causing it. I have a 75 gallon tank by the way and do water changes regularly. Any ideas? Even though my calcium is low I still have a decent amount of coraline popping up. You can se the algae towards the bottom of the glass


