I've tried to search everywhere, but I can't find anything about what sulfate levels should be in a planted tank...I'm just supposed to trust these EI Indexes that don't tell you how much the dosing would increase levels by. I just need a general idea.
Zorfox has a nutrient calculator that will tell you build up over time. And if you use the custom dosing portion it'll tell you what ppm of sulfur you're adding when you use k2so4, you can use that number to plot accumulation based on dosing schedule and water changes
Depens on substance you dose to your aquarium, so nobody can really tell you without that information. For example you can add Mg from MgSO4 or MgCl2. S is a macronutrient for plants just like N, P, K. We just do not worry about it since there are plenty of sources for it.
Everywhere I've read has said that it is a micronutrient, and it can be toxic when it is too high. However, studies I've read have said that limit ranges from 15-500ppm...
Bump: And again, just to be clear, I am wanting to know what the TARGET range should be, calculating how much the dose would increase it by isn't too hard, but it is kind of a pain that they don't tell you usually...
I do not know where you have read that S is a micronutrient. If it is required in the ranges you suggested it is definately not. Micronutrients are mostly in the ppb or lets say 1-2ppm.
I dose potassium sulphate too so I am pretty sure I have more sulphate than I need. That said with the regular water changes mandated by EI I highly doubt it will reach a toxic level, sulphate is pretty benign to begin with. Some water sources are also naturally high in sulphate. I also use a TDS pen to monitor my tank water and I would know if there is excessive accumulation.
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