Dragons breath turning a weird color?

[Northwest_Scapes_]

So I got some TSA Dragon's breath about 2 weeks ago and it's been doing great at bringing down my phosphates, but overnight it seems to have turned a weird color on some of the tips? Its kind of a weird yellow, and I'm not sure why. My theories are thats its dying due to it stripping all the nutrients or its gone asexual overnight (I don't think this is it though). Picture below

 

[ReefHog]

Not gone sexual. Most likely nutrients are too low. Possibly wrong lighting. I have some in a small lagoon tank I quarantine corals in with no fish and it stays that yellow/orange color in there. It doesn't die off. Red Dragons Breath is all I grow in my 220 Mixed Reef fudge. I swap the algae back and forth and as soon as yellow stuff hits the fudge, it darkens right up.