Clear slime?

[kreynolds1153]

I have a 60 gallon tank that has been up for 7 month now. I have a 4 cichlids and a pictus cat in there.
Ammonia- 0
Nitrites-0
Nitrates-20

What could be causing the slime? Is it algae? What algae eater do you recommend in a cichlids tank for clear algae?

 

[Delapool]

Might be some sort of fungus - is there much of it / what is it on?

If it is just a very thin layer, might just be natural biofilm and ok.