That Aqua C remora skimmer is probably the best hang on tank skimmer on the market.That said,i prefer an in sump skimmer for aesthetic reasons.Its very difficult these days to find a decent skimmer for less than $150.If your not into making adjustments to the venturi valve every couple days then go with a needle wheel skimmer that has a fixed air-venturi.Euro-Reef,ASM,and i believe Corallife all make an entry-level needle wheel skimmer .The ER and ASM both start at about $220,Corallife is the newcomer to the needle=wheel design and have there skimmers competively priced at about $150.