I have a 55 gallon reef and months ago I had a cyano
outbreak. I tried lowering feeding and I cut my lighting times down to 4 hours with no sign of improvement. I eventually cleared it up with 2 doses of chemiclean.
Well it's back again and this time after 2 doses and 2 20% water changes it's still going strong. I only feed a small chuck of food every other day and all parameters are 0 including phosphates. For water changes I only use ro
or the premixed salt from my LFS
. It seems to only be forming on the sandbed where ever the light shines. I just upgraded to 4 t5 unit from coralife so the bulbs are brand new.
The only thing I can think of is that I went back to using frozen brine an even though I was rinsing it before feeding maybe that caused the outbreak. I am now using my home made food of cod shrimp and oyster
Any ideas or suggestions