White foam in sump

[Mr Pleco]

White foam in the sump if it's not from soap. is an excess of organic compunds in your aquarium water.. Do a 50% w/c, skip feeding for a day and add some carbon for a couple of days( make sure you remove as most carbon is used up in the first 48 hours)....cut down on your feedings going forward, decrease bio load...GL

 

[blacksnow]

It's not foam. it's more like a layer of nasty film

 

[Mr Pleco]

Any room air fresheners running nearby?

 

[12 Volt Man]

its just from proteins from your fish food and fish detritus. nothing to worry about.