Anyone have any ideas?
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If it is a sponge or a tunicate then no these are not bad and are a good sign that the tank environment is ideal for these animals to reproduce and spread through the system. I would observe for a week or two and ensure that this critter is staying in place. If it moves then better pictures will be needed for identification. Do you have any live rock in this system or is it dead rock?Yeah couldn't get a clearer picture of it. I've only just noticed it today but hasn't moved since. Are either of those bad?
@KJ is correct
