These are fairly difficult to keep dialed in appropriately to avoid overflows and/or zero skimmate production. You can make them work for you but it will require you to keep the skimmer clean and regularly adjust it as needed. Simple things such as feeding or putting your hands in the tank can and will cause the skimmer to react. If you plan to stick with a HOB type skimmer said:Back when I was running a 30 hex and a 20 frag this is exactly the same problem I had. I got mine adjusted and really didn't have any issues from feeding or putting hands in the tank. It was my evaporation that always caused my skimmer to get out of whack. Just a 1/2 drop in water level (which in a 30 hex happens REAL FAST) would throw the skimmer off.
I replaced with a used Remora. MUCH better. In short, if it's all you have use it. If you can swing it, get rid of it and step into a better skimmer.