What are those?

[foxemty]

Whats are those whitish creatures/parasites growing on plants and side of the tanks? Are they harmful? How to get rid of them?

[DEA]

small white dots? moving around like beetles?

newly setup tank?

if the answers are yes, don't worry, they'll go away
just cut back on your feeding for a while
if you're not feeding, just carry on
they'll go away eventually