Furry Stuff On Decorations

[allan45121]

hi i came home from work to find this...

on one of my decorations the tank is a 70L with 7 tiger barbs and 2 red clawed crabs dont know wat it is. i have guessed at some kind of algea or mould ??

 

[Dwarfs]

Its probably algae if it's green. I have a lot of black hair algae, it actually looks nice when it completely coats rocks/fake plants

 

[allan45121]

its kinda white/grey colour like dusty colour

 

[Arfie]

Hard for me to tell from that pic, but I'd guess at diatoms, just take it out and scrub it with a brush and pop it back in.

Arfie