Excited or worried? What is this?

I sent it to some friends and two suggested sea squirts.

 

I agree with xroads friends. I think they're sea squirts (tunicates). Some people really wish they could get some to grow as they can be ornate, but they are something that only grows under exact conditions and you can't really force to grow.

 

So there you go, probably not worth selling for $500, but cool none the less.

 

I have one of these red ones growing inside of some rock hollows unfortunately only viewable through a half an inch hole in a rock. Im hoping it spreads to the outside rockface but its been holding where its at for over a year.

 

Its kinda hard to tell from the photo, I can sort of see an opening in the tops. Tunicates I believe will always have 2 openings separated by a distance. They use microscopic hairs to propel water through them and capture nutrients so there has to be a pathway for flow. If you notice two holes on them I'd say that confirms it. One might be a lot smaller or barely visible though compared to the other.

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The Sea Squirts and Tunicates (Class Ascidacea)

 

Anyone know what this is? It appeared on my glass over night last night.

 

What kind of snails do you have? Could be snail eggs.

 

Definitely snail eggs.

 

Ok thats a good thing. Nothing wrong with free clean up crew. I could always use more to clean my glass. I currently only have 2 fish so these might make it.