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Seriak
05-03-2012, 03:39 PM
Is this some type of sponge? No not the zoas. The little ball with all the little arms. It's half black and half white.

https://lh4.googleusercontent.com/-qiAy2_TIVrA/T6Kn4YUYHYI/AAAAAAAAB18/v5WlTNYcLJ0/s640/IMG_20120430_183011.jpg
fishytime
05-03-2012, 04:12 PM
Hydroids?
Seriak
05-03-2012, 04:24 PM
Hydroids?

No, I have been tested. :)
Leah
05-03-2012, 05:05 PM
No, I have been tested. :)

Who was the lucky tester? :bump2:
canadianbudz604
05-04-2012, 01:24 AM
i got a blue ball very similar to that in my tank as well. when i looked at pics of hydroids they dont look the same...
MrGoodbytes
05-04-2012, 03:21 AM
I can't say for sure from the pic but it sort of reminds me of a kind of cyanobaterium: like cotton candy algae. Have you touched or poked it? Is it spongey or hard or loosely intertwined? If there are polyps that retract, then it's hydroids but it seems weird for them to grow in a ball like that.