Seachem product. I also use Continuum Freshwater Iodine Supplement and my shrimp coop with no problems. I used to add CO2 but now my tank is low tech. This gives the same results as CO2, but I have a smaller tank so it's more economical for me to use either that or CO2. So far I'm happy with Continuum products, but I also use Seachem.
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