My mystery snails are about 1-month old. They have strange growths above their heads. I recorded these "Cousin it"-like growths and posted it on youtube (link below) but no one has told me "it's natural" nor offered any advice. I have never seen this on any MS I have owned. What makes it truly bizarre is the fact that these growths are perfectly spaced and segmented in an even number just above their heads, as if it is natural. They are located on/in the soft tissue part of the snail, not the shell. I tried to manually remove the growths but the snails go deep inside their trapdoor and the growths go with them.
Their home is a 10 Gallon, with 2 Guppies, 2 Otos, and them -2 Mystery Snails. Ammonia 0, Nitrite 0, Nitrate 20-30, Ph 6.8 (Doing a lot of water changes) Nothing thus far has helped.