L/F External Skimmer
 

I'm in Vancouver and I've got a 55 gallon tank and will be adding a 20 gallon sump w. refugium. I'm wondering what kind of external skimmers are out there? Can ship collect.

if you have a sump, you can use a in-sump skimmer. That will give you peace of mind from overflowing. Anyway, i got a CPR Bakpak if you are looking for external.