I'm afraid I'd have to agree. This skimmer won't help you any at all.
My first choice for a 30g tank would be an Aqua C Remora with a MJ1200 powerhead. Second choice would be a Prizm Deluxe. The deluxe version comes with a surface skimmer which will increase the efficiency of the skimmer. This option is available for the Aqua C as well. IMO
, the Prizm would be about maxed out on the 30g tank while the Remora could safely handle up to a 55 gal