What’s the cloudy film floating on top?

[kl0110]

Water is normal and I just did a 20% water change few days ago.
what’s the cause of this? Should I be worried?

 

[Glenner’sreef]

Do you have an overflow? That should take care of it. Or do you have a closed loop system? Then not so much.

 

[Gup]

Also, do you have a hard lid? That film on top can very well be house dust.

Should my water level drop below my overflow, with my lid open, I see the same film.

 

[malacoda]

+1 What type of overflow do you have?

Film on the surface of you tank is usually an indication that water isn't flowing into the overflow properly.

 

[KC's CNC Creations]

The film is a collection of proteins, as mentioned above there can be several reasons for them but without knowing your setup it’s hard to give a useful solution. It can be as simple as directing a pump/powerhead toward the surface to help them down an overflow to a skimmer to remove them, back in the good ole days before skimmers we used news paper to remove them.

 

[HuduVudu]

DOCs

I use a pump that turns on every hourish that pulls in air, creating a mist of bubbles. I run it for about 2-3 minutes. I am unable to easitly set up an overflow on my tank.

 

[ZoWhat]

Could be the ghosts of past fish