Mixing Types Of Snails

I have a small tank where I've been breeding bladder snails and ramshorns. I recently put some MTS in there, but was told to remove them ASAP because they eat other snail's eggs. Is this true?

 

My mts never come out of the gravel.

 

I've only ever seen MTS buried in the gravel. Except for one time where a mass of small MTS was floating along the surface of a tank at my college.

 

Well, it's an acrylic tank with no gravel. But I noticed that all the MTS immediately hid under the cuttlebone. Just to be safe, I took them out. The bladder snails have been laying eggs all over the place, and I don't want to risk losing them.

 

MTS love hiding in gravel, so unless you have gravel I would suggest not having MTS anyway. That's possibly why they immediately hid under the cuttlebone.