I have been battling cyano for some time now. This isn't the first time I've had a problem with it but that was in another tank and I successfully beat it.This time though it's got me stumped. I tried all the common tips (increase flow,vacuum sand bed, large water changes...) My current parameters are No3 <4ppm Po4 0 ALk 8.4 Cal 425 Mag 1350. I have been searching videos and articles and I saw bacteria dosing was a way that has worked for others. My question is which one/brand. I've narrowed it down to Koralla Zucht or Microbacter7. Hoping someone could give me some input.