I have a 180g saltwater tank. I bought it 6 weeks ago. It was already a 3 year established tank. So far everything survived the moved. As well as a few new editions. We have three clowns, 2 blue damsels, 2 black damsels, 2 white striped damsels, 1 yellow tang, 1 mandarin dragonet, 1 lawnmower blenny, 1 chocolate chip starfish, 1 conch, 4 turbo snails, several hermits, 1 peppermint shrimp and two blood shrimp. Everyone gets along. Water levels are spot on. Tonight I was looking for my dragonet and noticed what looks like a smooth, round, white ball attached to a rock. None of the fish seem to be "protecting" it or attacking it. Can anyone please help identify it?
Are these fish eggs?
- Thread starter Nancylarsen
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Can a sponge just appear like that? I never noticed it before tonight. If it is a sponge, is it ok to just leave it be?
Sponges are good filter feeders and a good sign of a thriving tank. It may have gotten bigger so you are just now noticing it. There is a very good chance you have more in your tank. Happy reefing! 
Paul B
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I go with sponge. The only fish you have that would spawn are the damsels and this is what damsel eggs look like. They also guard the eggs.
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