Yes you are going to hear a lot of people tell you that the SeaClone is a piece of junk. People hate the thing. And well they have reason because for the most part they are right. I too own a SeaClone and out of the box the skimmer is not very good. IT produces little to no skimmate and it requires you to make adjustments to the air input each day to get it to function.
That said you, like me and many others, may not have done your skimmer research prior to purchasing the SeaClone or maybe you just got it because it has once write ups by the manufacturer and it is one of the less expensive models. Either way you have 2 options. Get a new skimmer or try and make the one you have work.
If you don't want to fork out more money then you can try modifying the SeaClone. There are several mods out there and you can just search "SeaClone Modification" on GOOGLE. But here they are:
1) You can add an air pump and air stone to the system. By cutting a hole in the top of the collection cup lid and lowering air tub and a wood air stone to the bottom of the skimmer you can produce extra bubbles to help make skimmate. It does help but I need to prefect it and try a different and more powerful pump
2) You can attempt to cut the small 1" diameter tube at the bottom of the skimmer. This is typically about 4 inches long but if you can cut it down to around 2inches you will benefit from having the bubbles increase their reaction time with the surrounding water. Some people say you can wiggle that tube loose take it out cut it and put it back in. From my experience it is near imposable to remove that tube so unless you have a dremil and you can cut it while it is still in the skimmer good luck. I was not able to do this mod.
3) In theory this mod is a good one and I have seen some results from it already but will know more when I get home today. It is simple. In order to force the majority of the bubbles and air out thru the collection cup you need to find a way to seal the collection cup to the middle cylinder. I did it using silicon tape. I wrapped a bunch of the tape around the bottom of the collection cup so that when I put it back on the skimmer it was a little bit of an interference fit with the middle cylinder. This equated to an air tight seal and I could tell pretty quick that the air flow thru the cylinder has increased by a lot.
Good luck. Let me know how it goes.