What are these?

[Al G Blenny]

The first is Protopalythoa. People use the name Palythoa a lot now but they don't use it describe the right corals. There is a bid difference.

The second is definately Hydroids. Usually they grow for a while and end up dying off if your tank is healthy. I don't know what causes that but I have seen it happen a lot. I have also heard of people rubbing a Euphylia on them regularly to kill them. The hydroids do sting so you don't want them to grow everywere.

 

[Kinetic]

maybe it was my 4g's unhealthy state that made them grow, because my 32g is pretty darn stable. interesting...

 

[jedininja]

keyhole limpets are also reported to eat them.

And with an unhealthy tank, it might also be why your zoos didnt open up.

 

[Kinetic]

my zoos were opening up, just the ones touching the hydroids would be closed =/