I noticed that the water has become covered in a oil substance at the top of the tank... and its nasty. Its rather thick. I don't know what it can be from. I have a few pics. What I have in the tank:
I really hope its not the heater. How can I tell what its coming from.
I also Realized when I did a 50% change this week a piece of hair was tangled in the plants so it could be from that? but I'm not sure cause I took it out and the water still got oily after the 50% water change
Here are the pics... someone is quite nosey too as soon as he saw the camera he came up to the top to pose