might have made a mistake I dont know if I can fix

[FragIt Dan]

Originally Posted by nanomano

well its volcanic sane so would it be iron? its hard to say what type of metal is in it.

It is iron that makes it magnetic, although this is not to say it is the only metal in the sand. The company declares the sand 'reef safe'. The comments from those urging you to remove are likely based on the 'better safe than sorry' approach, although I am just guessing. You can always contact the manufacturer and ask them

[gregzz4]

The magnetic parts of your sand may wreak havoc on your power heads and pumps ... both their impellers and the impeller housings

[daniella3d]

To be safe I would put some sand in a small volume of water for a while and test that for heavy metals like copper.