Cannot get rid of cyano!

[Nate]

Originally Posted by MarkoD

diatoms cause by silica?

how do i control it? i've changed over 150 gallons over the course of a few days and used RO/DI water

Not sure if you have been doing a really good gravel wash yet but I would do that. Also, you are probably going through a mini cycle due to using an antibiotic and dips in your oxygen levels.