Yeah I’m leaning towards malnourishment too on the Dracula, I see no other cause of death. Just so sudden. I didn’t see him all day today so maybe he was slowly dying I’ve set traps in my tank on multiple occasions and never caught anything except those cirlonoid isopods I was fighting.Skinny eating fish sometimes make it and sometimes they do not. It is definitely risky. Sometimes it is internal parasites and they will keep eating until the end.
There have been multiple deaths but I suspect the two fish deaths are not related. The shrimp goby looks intact and probably died gave into malnourishment.
I wouldn't be surprised if there was also a crab or such lurking as well. The little one you found does not look like it was going to grow up into a nice one. You can catch the crabs by putting some fish food in a glass or such and leaning it up against the rock or such.
Was definitely a dead crab lol. I basically have flipped every rock. When I was trying to catch a different pistol shrimp (bullseye) a few weeks back I had to take all the rocks out and inspected them all. Even this crab was hard to find. I’ve only seen it’s legs a handful of times and only saw it’s whole body when I was trying to bait the pistol shrimp but it scurried back into the rock when I tried catching ithe said he found the crab dead though, i still suspect either it was really complete molt he found or there is another crab in there. They are hard to find unless you flip every rock though