I have two cleaner shrimp in my 75 gallon tank for a few months now. They always come out during feeding and have made a cleaning station in the tank. I pretty much see them every day. My aqua scape is pretty simple so when they molt I can see them most of the time. Recently I haven’t seen them anywhere. They haven’t came out for feeding or anything and that’s both of them. I also had an accidental pH and alk spike and the only thing that seemed to be affected was some of my corals witch are now starting to open. Is this normal behavior for cleaner shrimp or are they dead? I have seen a piece that look like it could be a molt or what ever but I’m not sure and if they did die my pistol shrimp would have probably got them or my nassaruis snails would probably have gotten to them as well. Any knowledge about cleaner behavior would be greatly appreciated.