Aside from chemiclaean which has not worked on my sand bed (yes, it is 100% cyano). Vibrant? Peroxide? Dr. Tims?
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the sand rinse thread has no losses against cyano and spirulina. when the offenders are blasted out of a sandbed with hot tap water, they're gone, at least for that import round.
Mainly this cleans the food base out. They're among repeat-vectored offenders that ride in from nature, and our gardens, many places, regularly.
To have a clean sb is the best defense and offense, then we work up from there. we find those to be more of a matter of farming them on purpose than anything else. When they're allowed to mass, they collect feed better, have shelter better, the forced removal attacks on several fronts. its the best method there is, to have a sandbed that cannot cloud when you reach in and drop some on test with the tank running. Most sandbeds will cloud massively, and there's the feed source in action.

