We have been using IQ salt since we started with our tanks but noticed recently observed a light brown residual in bottom of the mixing buckets. Has any one observed this? Concern is what is this material? The chemisty for the tanks are okay notihing that I can see. The only problem is aptasia explosion in our 24g nano and growth of I recently switched to new bucker of seachem salt and did not observe this residue.
Mike
Mike