Refuge macroalgae

[reeflife75g]

In my refuge my macro algae used to grow really really good and lots of it would be coming out each week I changed lights and now it's not good algae at all it's yellow and bubbles and not producing right why would this be ?

 

[Lasse]

To which light do you change too - and from what? Whats your NO3 level?

Sincerely Lasse