Can anyone please tell me what these are?????

[rosek007]

Ok guys and gals In the Pic Its the 4 white pearl looking things shaped like fingernails and slowly spreading throughout my tank. At first there was one but these popped up as well as another on the side glass. Can anyone identify for me please?, are they good bad or other?

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[sellersmd]

They are most definitely egg sacs of some sort, but I couldn't tell you what critter made them.

[sellersmd]

Upon further investigation, they look similar to eggs laid by some sort of conch/whelk.

[rosek007]

I do have a florida fighting conch in there, that would be awesome.