Hey guys. Have a well established biocube 31 running for 9 months now and have always run the v-2 stock skimmer. Yesterday I noticed no bubbles? It’s pumping fine, I pulled it out and cleaned all the inlets, nothing seems clogged at all. If I pull it half way up out of the chamber, it bubbles like crazy. When I lower it back down in place, it’s flowing fine but no bubbles anymore. Anyone have this problem and or know how to fix it? Thanks in advance.