Looking for Guidance- Cyano in Sump
 

My reef is 90 g with a 30 g sump. It is 2 years old and mainly sps. All is going well in the reef but over the past 2 months I have started seeing cyano in the
the sump in the centre refugium chamber (which has about 2 inches of sand and a little rubble rock as well as chaeto.) Cyano has never appeared in my system before. The return pump is a aquarunner 2500 and I am running multiple powerheads in the main tank. I am also running gfo in a TLF reactor using a small powerhead in the sump.

Any ideas on my the cyano is limited to the sump? I presume it is a lack of flow issue or lack of clean up crew? I could increase to a larger return pump or installing a powerhead but would appreciate your guidance first.

Also what does everyone think about dumping the refugium, at the very least the sand in the refugium?

Thank you

Anyone?

Bulbs could be getting old?

Try a black out for a couple days see if it goes away, and then if it comes back.

Thank you for the reply.

I changed my refugium bulb one month ago. I am using a 6500 daylight bulb as recommended on the Melev's reef site. I will change it again after a couple days black out and see.

I have also read that any FEO leaking from my reactor could contain phosphates and obviously iron, the two things that I understand cyano may need. This could have been the case as I recently changed the FEO. In the meantime I have cleaned out the cyano and went to a slightly more powerful return pump I had on hand, a eheim 1260, to increase flow.