Hi all,

I recently had a problem with my filter and while cleaning it I found A
couple of conical shaped shells in the filter media. It has been less than
two months since that problem and I started having the filter problems again
and this time I noticed quite a few more of these conical things. They vary
in size with some being as long as a quarter is wide. They are a dark brown
or black and seems to be something living in the shells. I don't know how
they got introduced and I am positive that they were not all introduced by
me which leads me to belive they are growing in the tank and somehow
producing their on shells.

Should I be concerned? I think it might be some kind of snail. Do I need
to get rid of them and if so how would I go about doing so?

Thanks in advance
Jimmy