I just set up my 20 gallon saltwater tank. I added live sand yesterday, and just added 25lbs of live rock today. I got some live rock from an established tank of a friend. I put the live rock in and I see that there are about 30 quarter sized brittle stars on the rock and sand now. What should I do? The tank isn't cycled, and I feel like that is way too many for my tank. If they die, then that's just going to skyrocket the ammonia. Is it best to try and get as many out as possible?