Im all for chemical warfare when it comes to cyano bacteria.
I have used antibiotics for this purpose for 10 years
I have done everything trying to battle cyano and this is what i end up doing every time ...
so i now just cut to the chase if i have a break out once a year.
I have never lost shrimp/coral/fish from using these medicines
and running active carbon for 24 hours will remove any organics and leftover meds
I use to treat with 200 mg of Erythromycin per 20 gallons of water
for a few days.
(i continued skimming) and ran carbon for 24 hours the day I ended treatment.
recently i used APO-amoxycillin 1200mg 1 time
and have not had any outbreaks again.
the medicine i use is normally left overs from family members sore
throats being viral and not bacterial (therefore they stop the antibiotics)
and i use them for my fish tank
often you can also talk to your local pharmacist, they are really helpful if you explain
your problem and have often given me the medcine.
or your local pet shop carried these meds.
hope all goes well in your battle
cheers