Macro Algae turned White!

I have a piece of macro algae. Im sure you guys will recognize it. I did a water change yesterday and i woke up this morning and it turning mostly white? Anyone know why? Will the green come back? Or do i toss it?

 

I forget the name of that macroalgae, but I do know that it turns white if it has too little light or if something bothers it. Check your salinity and parameters. Maybe the WC threw something off.

 

its a biocube, with the lights it came with. Is that too little of light? 2 compact florescence 18 watts each

Its a halimeda

 

How long have you had the macro. That might be too little for halimeda. I had some that died under 260 watts of PC in my 90.

 

We've had it for about a month

 

Halimeda.

From reefkeeping.com-

"Halimeda's sexual reproduction is similar, but with the added benefit of a known warning indicator. Hours before releasing gametes, the algae will turn pale white with dots of very dark green or almost black along the edges of the thalli. The dots are called gametangia and contain all of the contents of the living plant, concentrated in tiny capsules. This creation of the gametangia is called sporulation. Shortly thereafter, the gametes are released in a fashion similar to Caulerpa's. Plants that reproduce in this fashion, with the entire plant becoming reproductive, are said to be holocarpic. These sexual events have been blamed for sudden deaths of tank inhabitants, and the secondary metabolites of the algae are often fingered as the cause. While this is certainly possible, it seems more likely that fish and invertebrates succumb to oxygen deprivation during these gamete-releasing events. The entire content of large masses of algae is concentrated in millions of short-lived gametes, putting an incredible oxygen demand on the system. Under these circumstances, immediate partial water exchanges combined with increased aeration and protein skimming are called for."

 

....

 

so get it out of my tank?

 

It just turns into sand halimeda sand - Google Search