What Is This?

[pompeydaz]

I have to keep cleaning the glass and stones because of this, what is it? any ideas? Only been happening recently

 

[Baccus]

It could be a type of slim mould, interesting stuff not really any animal although it moves and not really a plant (it will also appear over night in gardens and lawns but often dies/ disappears once the sun hits it). Usually its a sign of left over food in the tank. If it is slim mould it will just appear and disappear on its own. You might be able to suction the bits out of the tank, but if the cause isn't fixed it will just reappear.

 

[pompeydaz]

Yeah, it doesn't move though, once its there it doesn't move again. But I just give it a wipe and its gone. Could be to do with too much food actually, as my angel fish eat loads, so I'm having to put alot in to make sure they all get food.