can chloramine cause cyano?

[iceman86]

Ive been struggling with cyano for a very long time and cant ever beat it. Once in a while I have to use chemiclean to clean it up but it comes back soon after.

Im running a full blown sps tank with a couple softies and everything is colorful and thriving. Parameters are perfect for sps and lighting is led so its not old bulbs either.
Flow is more than enough also.
Rodi water with 0tds coming out.
Im even carbon dosing and adding bacteria and wont help either.
I have no algae in my tank at all except cyano.

Temp 78
Alk 7.5
Cal 430
Amm 0
Nitrites 0
Nitrates 2
Phos .02 (change media every couple weeks)

Ive covered all the basics and the only thing I can think about is either my salt (H2ocean) or chloramine which I recently learned Edmonton puts in the water and an rodi system wont remove.

Any ideas?