ID Request

[Myka]

Originally Posted by monocus

what they are are Cassiopeia,upside down jellyfish.i use to get them in the hundreds-basically harmless.i figured i was getting them from my brine shrimp eggs

I'm pretty sure what you're thinking of is hydroids, which are a very common contaminant in Brine Shrimp eggs, and have a medusa (larva) stage that resembles jellyfish. Unless the OP has adult Upside Down Jellyfish in his tank, the odds of these being larva from said species is extremely slim.