Help! Not sure whats wrong

Hello fellow RiU members. My cotton candy seedling isnt doing so well. It sprouted from rockwool fine and I put it in my waterfarm after roots were showing. A week later, this happened

Any hope on saving it? My other seedling is doing just fine.

Looks like it's become iconized. You need to take immediate action.

What does that mean exactly


Sent from my SCH-I545 using Rollitup mobile app

Anyone? What is iconized?

Sent from my SCH-I545 using Rollitup mobile app

Dude,there is no picture, just an icon. Get it now?