Industrial black Fe(III)O4. Not GFO

[Piranha76]

Saw on eBay I can order 10 pounds of Fe3O4 for 25 bucks. Anyone use it as a substitute to GFO. dang GFO is do expensive. BTW LiveAquaria which sucks since petco took over is selling GFO. CHEAP.

Here is a link to the eBay listing. Google 10 Lb Black Iron Oxide - Fe3o4 - Magnetic Silly Putty / Pigment

 

[Pife]

I would figure out how to quit using it.

 

[Piranha76]

It’s seems like it’s a staple. I never used it before and everything is stable but all I have are zoas and anemones. My PO4 is over 2ppm but that’s all my measurement does.