I should add: CO2 may be a problem as well. The biocube's dont really have that great of flow and are closed top, which won't help. And it could explain a low PH reading. I would wait to see what a second source tests the water as before making too many decisions, but I would definitely recommend getting at least a koralia 1 to throw in there, if not a pair. The added flow will help ALL of your params and help keep the corals happy.