I also think it looks like you may be adding sps way before your system is ready some people wait for upto a year not saying you need to but your system needs more cycle time in my opinion also you should fix your mag that's pretty low.get a container of mag chloride and mag sulphate at jl. You can use randys 2 part recipe for mixing instructions (found on Google) it will take a lot to get it where you want it. Just because you mag has always been low don't make it right. Personally I would be worried if my mag was at that level.also if your phosphate is zero that's a issue but think you may wanna review the instruction with your Hanna with all that sps melting away your phosphate are rising not a chance there zero. By the way I keep my phoshate no lower then .03 no higher then .06 I find any lower you loose colour any higher you grow algae.
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