What Is Growing In My Tank?

[sbga]

This stuff recently started growing in my tank, it's all over everything. I did a 50% water change and cleaned the bottom since I noticed it. Never seen this kind of algae(?) before. What can cause it?

 

[fozzy81]

Im on a mobile so picture looks bad but could be hair alge ?

 

[delta]

It's quite hard to tell from your pic but is it a kind of almost jelly like whiteish stuff that's on the gravel, because if so I had that in both my 200L and Edge when they were still quite newly setup and I just kept hoovering it away when I did water changes it and after a few weeks it stopped re-appearing. I think it bothered me more than it did the fish.

 

[sbga]

thats correct, it's jelly like white stuff. weird thing is my tank has been set up for quite a while