I'll just throw in my 2 cents here....
We fought cyano
in a *major* way a few months back. Reducing feedings didn't help, changing/adding water flow helped minimally.
First, check your phosphate level. If your phosphates are at all elevated, your cyano
problems will be endless.
Also - age of lights? Part of our problem was letting our VHO
's get too old. Our main problem was not knowing that our RO
membrane needed to be replaced (failure to TDS
test often enough - lesson learned).
ANYWAY, we fought a looooong battle, finally threw in the towel, and dosed Ultralife Red Slime remover.
Worked great -- cyano
dissapeared totally ... for a few weeks. Yep. How horribly discouraging.
If you don't eliminate the cause, the antibiotic will NOT help you. The only thing that finally solved our cyano
issue was continual, rigorous maintenance, we did twice-weekly 10% water changes, siphoning out any existing cyano
for almost 2 months. Make sure your bulbs are not old, water flow/current is good, feeding is no more than necessary. Use a refugium for nutrient export if you can, and skim like the devil.
Just a side note. If you do dose with a cyano
remover - be prepared ... you will need to turn off your skimmer, and you will need to find a way to somehow maintain your pH. Ours dropped out of sight. We had to kill the ca
reactor, drip kalk
like it was going out of style, added a couple PH
's to the display - and even threw venturi tubes on those for oxygenation - even then, we barely
saw a *high* pH of 7.9.
Good luck! Cyano
has got to be one of the most frustrating things in this hobby.