All, my tank has been established for a year and a half now i got rid of the red slime algae long ago but it seems to for some reason have reappeared. My params are normal and okay but phosphates are .4. I also use RO
water and havnt changed the filters in a while but im not thinking this is the issue. I just replaced all carbon in my filter so that should be fine and i leave my T5s on 12 hours. I have had them for 6 months now running 12 hours daily. I think the lighting spectrum has dipped into the nm range that the algae thrives so i believe replacement of the bulbs is required. My lfs
seems to think the bulbs are fine and should last another 6 months. What has been your experiences ? I find it funny i changed nothing from what i did before and i didnt have it then but it just came from no where and now i cant seem to get rid of it, not even with 40% water changes! It comes back, i am not over feeding either. Thoughts ?