[waterblossom]

Those don't look like malaysian trumpet snails to me. But I'm not familiar enough with rabbit snails to say if that's what you have, either.

Oh I’ve never heard of rabbit snails before! But I looked up pictures and it’s a much closer match than an MTS. The ridges of rabbit snails are prominent, but like MTS, the conical shape of their shell seems more elongated than the ones I have... 😞

 

[waterblossom]

Doesn't quite seem like MTS to me, MTS are usually a solid color shell (in most cases) ranging from light to dark brown and the conical shell is more elongated (think unicorn horn). Hard to tell from the lighting but I don't think they're assassin's either. The coloration seems right for assassin's but could be rabbit snails. I'd say the real way to distinguish is to see if you can get one of them to go on the glass, assassin's have a pretty distinct soft-body look from other snails.

I caught a picture of one on the glass. Sorry about the blurriness, my camera can never seem to capture through glass/water that well. But it has a base and then one of those tube-looking mouths like the MTS.

 

[waterblossom]

They might be Tarebia granifera (Spike Tail Trumpet Snail). I don't have photos of these kind of snails.

Also for baby assassin snails, their distinctive pattern & color is already evident even at small size. Here's a photo of a baby assassin and it's just a bit bigger than the grains of aquasoil.
View attachment 867455

Spike tail trumpet snail! That must be it 🙂 I looked up some pictures and my snails look almost exactly the same! Thank you for the ID 🙂