Yes, I imagine you will. Over time as your tank matures.
Great hitch hiker you have there.
It was funny to me, when I started out in this hobby way back (never mind how far back
)... The first time I saw my own tiny brittle star, I was so fascinated by it. Then months later I started seeing them all over the rocks and glass. They were most active at feeding time and I couldn't believe how many I had.