I run plenum with 4" of Caribsea's Special Grade Seaflor Aragonite amd 2 riopowerheads with spraybar and that's all. No skimmer. Haven't done a water change in 10 months. Calcium 480,Alk 9 dkh,nitrates 0, nitrites 0, ammonia 0, ph 8.3. Tank contains Soft corals, LPS, SPS, and clams. All all...