It's white algae it's common in new tank and perform a partial water and reduced the feeding and lights and even if less oxygen supply this will happe...

I had brought 3kgs gravels for border and top cover cover of sand... Sand is very old it used to smell in my previous aquarium and I have treated in s...

I have added plants same day and I did 2 water changes all 20% I thought of cycling the water for 1 week and add shrimps first