[wyeto]

I had the same problem I had string algae and I did spot dosing with a turkey baster and the next couple days it turned gray and it didnt kill any of the algae. I dont think it will leach anything and it might have a chance to come back.

 

[wyeto]

No it didnt but I did multiple spot dosing and I just got some more and took the old stuff off. When I initially got it it was in bad condition and had brown spots on it. I got some more from Tex Gal and it is now growing great. It is worth a try to put it back in tho.