Reddit reviews Zinc Sulfate/Fine Powder / 4 Ounces / 99.3% Pure/Ships Fast from USA

Thanks again, this is all very helpful. I was thinking i might have to go ACS, and Reagent grade since Spirulina absorbs heavy metals apparently.

I was kinda torn between getting cheaper ingredients now for fish use and upgrading later for selling quality, but now I think I'm defiantly looking to be able to sell (Spirulina and Zarrouk). So I'll be looking into the ratings. However, resources like your link will be useful for cheaper options for fish food. Tbh I'll probably experiment more with common garden fertilizers and such for this purpose.

Also, I'ts kinda awkward to be searching for "food grade" Boric Acid. So far even Quality ACS Boric Acid warns not for Food use.

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For others looking, so far the items I've found and am considering purchasing are as follows:

Dipotassium hydrogen phosphate

Sodium nitrate

Potassium Sulfate

Calcium Chloride

ethylene diamino tetracetic acid

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Solution A:

Boric Acid

Manganese (II) Chloride Tetrahydrate (MnCl2 . 4 H2O )

Zinc Sulfate

Copper Sulfate

Molybdenum oxide

I'll try to make a complete edited list after some more research.