Stargrass is blackening

[swanandmokashi]

Why is my stargrass blackening.

I am doing with following dosing
M-W-F
half of 1/8th tspTrace Elements

TU-TH-Sunday
slightly more than 1/2 tsp of KNO3
half of 1/8th TSP KH2P04
Slightly more than 1/8th tsp K2S04

Saturday
Excel

SUNDAY
50% weekly water change

I have DYI 4 2 Litre bottles of CO2. Oh this is a 55 galon tank. All other plants seem healthy,

 

[JDogg]

blackening as in dying or blackening as in covered with BBA?

 

[swanandmokashi]

Blackening as in dying.

 

[rich311k]

Check out this thread.

http://aquariumadvice.com/viewtopic.php?t=87393&highlight=stargrass+black

Sounds just like you problem with it.