Brown algae(I think its diatom)

Hi all ,

This is my 1st post here.


My glass,leaves of my plants,the filter & the gravel all are covered by a Brown slippery thing,which I think is Diatoms .

The tank is a 50gallon,the lighting being 65watts x 2 for 10hrs a day.
My tank doesn't have many fast growing plants,currently I have many Anubias,Ferns,10 Vals & 2 Swords in it.I think maybe of less fast growing plants there is this breakout.

Please help........the tank has begun looking really ugly


Many thanks
Ravi