Zoas not opening

[sammo2001]

Hi all. I'm having a problem with my zoos not opening. I think the problem is because I have quite a bit of hair algae in the tank for some reason. I have just started a treatment of algaefix which I hope is going to fix it. I'm not sure by I have the algae as I have 0 nitrates and phosphates. I do water changes often and even use a phosphate pad in my filter. This is kind of a last resort it get rid of it.
My other corals are fully open and thriving but my zoos just seem a bit sad. They also seem to have a fluffy collar around them which I think might be annoying a them and keeping them closed.



Any idea what this is or how to fix my zoos?

 

[AbsoluteFaye]

I had a horrible hair algae outbreak for like 2 months. I added a phosphate reactor and large cleanup crew and it was gone in 2 days. My phosphates were reading zero when I had the problem so maybe your test is wrong. But what are your parameters and what kind of lighting do you have? Also what size tank?

 

[sammo2001]

Here is a snapshot of my last water test





It was a couple of weeks ago but I will do another one today but the results won't be far from that anyway. The tank is a 100L with two T5 tubes (one white and one actinic). I have a cucumber, some Nassarius Snails and a Lawnmower Blenny to try and get rid of the algae.

 

[Keithhjs]

Your hair algae is most likely consuming your nitrates and phosphates and that is why your test shows no detectable amounts. It's feeding the algae.