Yes, you need a MUCH better skimmer.
I had a Skilter 250 on a 10g, and it was barely adequate for that.
Skilters are ok for water circulation and poly/carbon filtration, but the skimmer is just awful.
If you want a hang on skimmer, look into the Aqua C Remora or Remora Pro, the Corallife Superskimmers or the D&D Typhoon
HTH,
Mariner