Help with skimmer

[Proteus]

First I would take pump apart and clean it.
I have found that certin medias such as filter floss affect skimmers. If you use try without.
Are you adding any additives to tank that may affect skimmer

IMO there's not alot of good hob skimmers. Deltec and reef octopus would be my preference.

Some more info about setup and water params may help