u/Fluffy-Audience6476

Can anyone help. I think I’m going mad.

So I have been given a fishtank. It has snails. I thought they weee ramshorn but turns out they may be Malaysian trumpet snails I also have 4 assassins in there. As well as several fish
However. What are these snails. The ground is literally moving!!! Also these bubbles. What the heck. Please help