Red spot on my gsp? Doesn’t wanna extend

[Reef_at_Sea]

There’s a reddish purple spot on my GSP.

I have it for a while now & it never extended properly.
Is my gsp sick / dying or is it not placed right?
What could this be? Thanks!

 

[Jekyl]

It's just tricking you before running rampant and ruining your tank.

 

[Reef_at_Sea]

It's just tricking you before running rampant and ruining your tank.

Hey, its you again!

The devil comes in many forms, but i believe in our lord & savior to let me conquer this GSP