I don't think my skimmers are doing the job they are capable of. I have a lot of debris/bugs on the surface of the water. The skimmer in the shallow end is suctioning well and skimming well it seems. There is lots of water movement inside the box. However, in the deep end skimmer the water is barely moving inside there and not near as much suction. Anything sound abnormal? Can I do anything to help. My water level is at the little arrows on the skimmer.