Ok question. What happens if your amazon pumice has trace metals etc and you have inverts/ corals etc?
But you have not answered mine... lol
But to answer yours, I don't have inverts and corals and I don't know what will happen if my pumice has trace metals .. so I can't answer you... you had bad experience?
I thought your concern was time vs money..... if it's playing safe , seachem should be safer...... but I don't have the expertise to check if the matrix has trace metals even if it leeches