Hitchhiker bad or good?

[acolotto]

Got a colony of Gsp with some zoa looking polyp thought but don't know what they are and don't know if bad or good?

 

[acolotto]

Forgot pic my bad

 

[paul87]

Looks kinda like a moon polyp. Shouldn't be bad, I'd consider it a bonus. You don't have to worry about it killing your gsp's. They are tough.

 

[MINItron]

Definitely a zoanthid of some kind. Hard to say exactly what. Not a pest, though you may find that the GSP turns out to be a pest if it likes your tank.

 

[acolotto]

Yea I know but I really like the look of the Gsp is nice neon green so I hope it takes off in that corner haha

 

[MINItron]

GSP is great when you have a containment plan. Personally I love the look of a tank where the back glass and plumbing are covered with it or something similar.

 

[54seaweed]

my gsp took over the back wall , I love it
the polyp you see is a green paly pathoa
I also see some sponge growing from that cluster towards the top