Film on Sump Water Surface

[dangles]

Any idea what’s causing it?

I run a filter roller and a refugium. No skimmer. I only started noticing it recently. Part of that could be that I recently removed a flow pump I had in the refugium that kept the gracilaria moving and the water surface agitated. I moved a sea hare I had in the display into the fuge and didn’t want too much flow for it.

Anyway I’m considering two options…

1) Remove the sea hare altogether and put the flow pump back in.

2) Keep the hare and add a small HOB skimmer or maybe just a HOB filter on the baffle so it skims the fuge water surface.

Thoughts? Suggestions?

 

[bluemon]

Happens with no water movement.

All that film would be what a typical skimmer would pick up

 

[Mr. Mojo Rising]

I added a small tunze powerhead in my sump for just that reason, no problem since I added the powerhead.

 

[BryanM]

Same as above, with very low sump to tank turnover I noticed a film as well and threw a powerhead in there.