mysterious happenings...

[Pegasus]

Are we talking about a sponge or a coral here? Two completely different things.

If it was a sponge then the sponge would probably secreted a toxin when it died. However, you have a 120 gallon tank, a 2 X 2 inch sponge shouldn't do any damage.

If we are talking about a coral, either soft or hard, again a 2 X 2 inch specimen in a 120 gallon tank shouldn't do anything.

My guess is that the two incidents are unrelated. As Steve suggests, either the snails where at the end of their life cycle or perhaps they are being under fed? Die off due to a deminishing food supply is to be expected.

Larry