Originally Posted by
Ace25
Just going off your pictures, something about them just speaks to me that it is more of a phosphate issue than a nutrient issue. Call it a gut feeling, but take it with a huge grain of salt. Excess nutrients (DOCs) from my experience don't look exactly like what I am seeing in the pictures.. the second picture is more like a DOC issue (no polyps) but the first picture (which I am assuming that is a Garf Bonzai Acropora) has polyps out, but is browning, and that along with the brown spots on your turbinaria make me think phosphates. From my experience, if a tank has excess nutrients (DOCs) to the point that really affects corals, you usually will have some patches of hair algae within the display as well, no matter how well your filtration is working, and I don't see a spot of hair algae in your display pictures.