Just want to get clarification, are you asking 2 different questions? one about element levels and one about Dinoflagellates?? because one is not the cause of the other... The dinos are more a symptom of a young system, high nutrient, low light, low water movement, or combination of any of these.. the other is, like john said.. either a salt issue.. or your system is using it up faster than it is being replaced by water changes.. other than that.. dosing is about the only thing thats going to fix that