Cannot get rid of cyano!

[MarkoD]

any idea why my rocks are turning form a nice purple to a poop brown?

[RedCoralEdmonton]

My guess would be diatoms, and that underlying problem that has yet to be figured out....

Steve

[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

[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.

[gregzz4]

Originally Posted by Nate

you are probably going through a mini cycle due to using an antibiotic and dips in your oxygen levels.

This would be my thought

Are you aerating ?

[MarkoD]

I've got a sump. Orp reads between 405 and 420 like it always has.

But yeah mini cycle could be possible I suppose

[Cal_stir]

I had a small diatom bloom on my glass and substrate, nothing on my rocks. Your tank is going thru a mini cycle.
Are you dosing microbacter?
Are you dosing vodka?
I was dosing the ULN dosage of microbacter and biofuel.
I don't know what the dosage for vodka would be but there should be some info on this forum.
I did a 10% wc @ a week after to vacuum my sustrate, diatoms pretty much cleared up after that.
I also turkey basted my rocks.