Can someone identify this

[dirtrider29]

Hey guys,

Ive had a pink birdsnext in the tank for a little over 4 weeks now. I noticed the other day that purple is growing off the top of this. Im not sure what it is and wondering if someone could let me know.

 

[ValorG]

Is that area dead? Looks like algae growing on a dead area.

 

[CleanYourTank11]

+1 on the algae