I have had a lot of my acros get brown tips. I just started testing my phosphates and see that it’s at .11. I just did a water change after a month which is my normal routine. Haven’t lost an acro since March with that schedule Has been in place. The only difference is now I have connected my main and frag onto one system in June. July was fine August things are fine but this month ive lost a frag a week. I’m using t5 lights on both tanks, same lighting schedule, opposite for the refugium. I use a calcium reactor for the main three and reborn for the media. I just added carbon and gfo to see if it’ll go down and its been three days with the install of the reactor. Too early to tell I think. what I would like to know is what am I doing wrong that I could be doing right?