I got it for a sand sifter. Didn't do squat best I could tell. No tears hear. Threw it in the neighbors bushes so my dogs wouldn't think it was a dried up BBQ Tube-Steak.
I'd think about a water change and some fresh carbon. My situation was a little different, but I lost several tubs of corals due to cukes moving into powerheads. In my displays, they don't ever get that high, but in the tubs, there was no sand and the ph's were on the rock, so easy access. Large volumes should help dilute, but keep an eye on it.