I am currently battling Dinos, so I am testing a lot. No3 & phosphate levels started climbing after over feeding and turning skimmer down in order to get nutrients to rise. I decided to do a 10% WC at the advice of Mack’s Dino on FB. Well, 24 hours after the WC I tested No3 again and it seemed to climb from 25 to 30 +. My phosphate dropped a bit from .25 to .20. Side note: I added a bundle of macro algae to the tank this weekend too. What could cause the nitrate to rise after a wc?