Help.. What are these?!

[Breject]

Does anyone know what these things are? I have an upside down jellyfish and I thought I had some baby jelly fish but just want to make sure? 

[WV Reefer]

3 minutes ago, Breject said:

Does anyone know what these things are? I have an upside down jellyfish and I thought I had some baby jelly fish but just want to make sure? 

Possibly.  Are they on the glass or swimming around?

[Breject]

Both. 

[WV Reefer]

2 minutes ago, Breject said:

Both. 

Maybe someone else will chime in because I’m really not sure.... I have had hydroids on the glass that look similar but yours seem much more substantial which would make me think babies. 

 

Hopefully they are babies.   that would be awesome. 

[RayWhisperer]

The blue picture is definitely a hydroid medusa. Beyond that, I can’t make anything else out.  Clearer pictures are needed.

[sublunary]

I had the 4 or 5 of the same thing in my first tank. They swam just like tiny jellyfish, but would stick to the glass to rest. Never hurt anything and never got bigger. Eventually they just disappeared. 

 

I think someone told me they were a free swimming form of hydroids, but I never verified that. I did not have an adult jelly in the tank, so mine definitely came in on live rock.

 

EtA:  taking a closer look at your third picture, they might be a little different looking from what I had. So my reply might not be so useful.