Is that an Algee?

[dids22]

In the last couple of days I noticed that there is a new algae in my tank (The tank is 60 liters). I can tell that its starting to take over my rocks.

I've noticed my crabs doesn't try to eat it.

and it's hard to remove, even with scrath.

There are some pictuers in the next link:

https://drive.google.com/open?id=0B1k9M33xySG7c0pxa3lual8tWjA

Can anyone identify what algae it is?

Thanks.

[dids22]

someone?

[land shark]

Looks like a sponge to me

[lakshwadeep]

First pic shows a dark colored sponge (maybe algae growing on it). The others seem to just show some green microalgae, which you just have to accept will grow. It's a lot better than green hair algae.