Quote:
Originally Posted by Kevin Guthrie
The only things I know of that are that toxic to inverts but not verts are heavy metals such as copper or zinc and herbicides. Not sure how specific pesticides are wrt not harming fish.
If its metals I'm not sure how to decontaminate before the next go-round, They tend to persist.
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Running carbon will clean out the water, however rock DOES absorb metals.
depending how long and the concentration it might not be a factor, run carbon and get metals down to zero. Then takeout carbon and wait 48 hours, then test for metals. That way you know if the rock/sand are leeching. Keep testing, until your sure its not leeching.
My humble guess and experience would be running carbon for a while (month +) would remove everything and save the rock.
PS: i should add, im efficient with my money and im hard to worry. If your the opposite then 100% replace everything and be done with it.