You get what you pay or with smaller skimmers. Having said that, Sicce pumps are pretty much the best for a small skimmer (other than an air stone). Adding an air pump and wood air diffuser is one way to make drier foam. Raising the salinity to 1.026 will also help. It sounds like 9" is too deep for it to function properly. Try 7 or 8" and you should see drier foam. I assume you have inspected the needle wheel to be sure it is free of debris. The air intake needs to be cleaned with hot water and a toothpick to break-up salt that crystallizes where water and air meet.
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