Well dead black worms float where live ones sink faster, so I scoop them out with a small brine shrimp net. I think this was just an accident on my part. I feed them blackworms every other day and have gut loaded ghost shrimp available for them at all times. The shrimp are loaded with veggie waffers and mixed veggies. What happened was I fed them til they were plump the day before and I was trying to get my new ray to eat (they all are in quarantine in this one tank) and I think the one that puked just ate too much. Everybody is doing well and I am improving my filtration as we speak to prevent tradgedy in the future!