Hi reefing friends! I've been battling low phos and nitrate. Corals and fish generally seems healthy. Certain corals are growing slowly, primarily acroporas tenius/millipora, montipora digitata, and acanthastrea lordhowensis. Stylos are kickin' butt! Other softies are doing well also. In the latest testing is: Alk-7.5, Ammonia-0.13, Calc-430, Mag-1350, Nitrate-0.0, pH-8.2, Phos-0.03, Sal 1.025. All these are typical parameters. I don't have any algea/bacteria blooms or anything out of control. Just some slow growing corals. I don't like the ammonia levels but, can't seem to get them to drop below 0.10, even with dosing Prime. I dose NeoNitro to raise nitrates but, to no avail. Bottle says is if phos and nitrates don't increase after 24hrs then tank is "carbon limited". Researched this with mixed results on information. Does anyone have any experience with this? Any knowledge which might help? Also, maybe I'm trying to fix something that isn't broken? Thank you reefing friends!