Looks like Surface accumulation. What kind of weir/overflow do you have? If enough surface water doesn't go over, you need to agitate the surface with a power head or wave maker.
I have a peninsula tank and there are 3 sides that the water can drain to the sump. I’m thinking a wave maker may do the trickLooks like Surface accumulation. What kind of weir/overflow do you have? If enough surface water doesn't go over, you need to agitate the surface with a power head or wave maker.
"3 sides that the water can drain to the sump" really doesn’t seem likely, generally there is only one or two overflows. Dave is absolutely correct that lots of turbulance/surface agitation is necessary to remove the scum from the surface and get it into the water so it can be filtered out by the roller mat and skimmer.I have a peninsula tank and there are 3 sides that the water can drain to the sump. I’m thinking a wave maker may do the trick
2 over flows. I’ll send pic."3 sides that the water can drain to the sump" really doesn’t seem likely, generally there is only one or two overflows. Dave is absolutely correct that lots of turbulance/surface agitation is necessary to remove the scum from the surface and get it into the water so it can be filtered out by the roller mat and skimmer.
That’s a single overflow on one side of the peninsula. But get some pumps pointed to the surface2 over flows. I’ll send pic.
That’s what’s happening.From the picture it’s hard to tell but it looks like the water level in your overflow is the same as the “display” portion. This would cause the surface skim to not overflow down into the overflow but stay afloat while the water underneath it get sucked down. Also with peninsula tanks if your outflow is pushing in a wave towards the open side the skim may not be able to circulate back towards the overflow.