brittle star has many arms

[Joe Fish]

Is it normal for a brittle star to have more than 5 arms? I seen one in my fuge with like 6 or 7. Also, is a green brittle sea star the same as a green banded brittle sea star?

 

[TRe]

i kno the green ones are bad

 

[Joe Fish]

Are the two the same or is one worse than the other. I only have them in my fuge. I got one as a hitchhicker and now I have about 6 of them.