Hey guys this is a very odd and troubling situation i need some advice on. I have had many cephalopods and currently i have a fifty gallon tank and a 29 gallon tank. In the 29 gallon tank i kept a octopus briareus (temporarily) for two weeks. I then transferred him to the fifty five gallon tank and he is doing really well. Upon moving him i put a small octopus in the 29 gallon tank. I transferred him well and he was actually thriving, i put him in the tank six days ago. he found one of the many hiding spot i made for him, in the tank there were about 20 snails for him to snack on and i attempted to feed him shrimp from the fridge (which he was not interested in). I have a fifty gallon filter with fresh filters in it on this thirty gallon tank. This morning i found him in dire straits and i dont think he has long. I know unfortunately i cannot do anything for my small friend. But i was curious what went wrong because i need to make sure i fix something i may have done wrong. Was it just his time?[The bigger octopus briareus lived in this tank for a while and is still thriving in his new tank (to reiterate)]. Thanks, This is a picture of the tank.