90 gallon. 20 gallon sump with Bubble Magus 170 skimmer, filter sock, lots of chaeto growing fast
under a Home Depot 7000K Halogen. My main question is about additives. If a 25% water change is done every two weeks are any additives needed. 1.024, ph at 8, kh at 8.2(hanna), Ca 385, Mg...