enrique,
I have a SeaClone skimmer. A lot of people say they don't work well, but they are trying to use it on huge tanks. Even though it says up to 100 gallons its no where that good. Yet, as for a 29 gallon it works very well for me IMO. For the price, you get what you pay for, don't expect too much more. I plan to upgrade to a 90 gallon FOWLR, then I will be purchasing a Euroreef skimmer. I hear they are pretty good.