Nope was topping off with fresh ro/di Have not dosed anything have not had the need its always been high. So no overdose unless your talking about overdosing what was in the salt mix itself The only thing that has gone in the tank is the fresh salt water mix and if it was high that would raise those levels too high. but im pretty sure that both hydrometer's i had were very old so im sure the new one is closer than the old one. But like I said above the refractometer is on its way. So tis all good just gotta get my levels back down. And should make more sense. So would it not work the same way if my SG is up would that not raise my MG. And if so you say lowering the MG will in turn lower the SG. So lowering the SG would do the same thing. Bring the salinity down the MG will follow? I found the cause and effect here but failing to see the solution. Would it be to lower my SG down through multiple water changes at a lower gravity. Or are you saying to lower my MG and my salinity will follow and if this is it how would I go about doing it.