I am trying to have a one-gallon tank on my desk. I have four ghost shrimp and a danio (which was a mistake to get, by the way....talk about HYPER! He is finally settling down a little, and guess the thing will live to be a hundred)...anyway, I have had a couple of snails show up that apparently were in a green plant I placed in the tank. The shell is a pinkish brown, there are two antenna and a mouth with a blob of flesh that works its way all over the place So, is that what everyone is calling a pest snail? Just curious about the variety it is. Now, please advise as to whether I should allow them to stay. They are leaving "deposits" of a gel-looking stuff with white specks. Is that their excrement? Or is that eggs I don't mind them being in there, but I read in another thread that they can pollute the water. I will get rid of them before I allow them to cause damage to the first occupants. Two of the ghost shrimp were with eggs when I got them. I never saw any babies. Are the snails what possibly got the babies? I have read that ghost shrimp are hard to raise, and I wasn't attempting to necessarily raise any. But I thought at least one shrimp would have survived out of two pregnant females. Thank you for your info and input!