Is this Diatoms?

[Slyguy00]

I had dinos. I did 3 80% waterchanges. One each day. By the third wc there were no signs of dinos. So i did 2 more 50% wc and never had an issue again. And prior to that i had tried many different methods of killing it that did not work. This is just my personal experince but that worked well for me