Look what I've got

[Garf]

Have you been doing any waterchanges ? Just remind us about your scrubber lighting boss.

[kotlec]

Yes I do water changes . Last month about 50% total. 15% week ago.

Scrubber is lit by 5 reds and one blue 1w leds for 13 hours.

[SantaMonica]

If the flow is good, add some iron.

[kotlec]

Flow is very good. Will add.

[Nick28]

If you find the light method not working at all

It could be a non-photosynthetic dino

although I have to admit it looks exactly like the one I had but maybe not under a microscope.

[Garf]

Iron just increases the dino supply, it's something else.

[kotlec]

Hmm.
Third day in to reduced light. For today I decided to switch all lights completely. No food yesterday and minimal previous days. No other changes for experiment clarity.

[Nick28]

have they been reduced at all?

[kotlec]

Hard to say , since today is dark in the tank

I believe they are reduced some at least. Yesterday, when I cleaned gorgonians, they were less covered in that hell stuff.
Also yesterday I moved bottom substrate in to small hills instead of leaving it plain after cleaning. The hill in the nearest corner (I can see it in darkness) is not covered in brown threads .

[kotlec]

So dark cycle is over and lights are back.
There was much less brown hair when I just brought my lights back on , but after just few hours I noticed that gorgonians are covering in brown again.
Some ciano also noticed, where flow is restricted. Like under rocks for example.
Problem not solved.

Increased kh via kalkwasser dripping up to 10. PH only rised to 7,9. Possibly my problem is in low pH ? Why it is not rising ? Windows are airtight and my son is 13 years teen that lives and breathes in that room . May be this ? Outside is -8 degree Celsius if you gona advice to open windows . And no this is not normal temperature for March here.