Last time I asked for help was when my tank was full of dino. Now it is only on the sand bed and I am unable to eliminate the problem. Can you please help with with identification? https://photos.app.goo.gl/CRw4if2Xw7Tq3Us18 Sorry for the quality, cheap microscope and lack of knowledge how to prepare a good sample. From the behavior of my dino I am leaning towards Amphidinium since its only on the sand bed and it looks like it goes to the sand at night because strong UV installed in the tank did nothing.