Sorry Thales all nautilus were 7 in total my mistake . The tank has been setup for 5months already. I will post pics as soon as possible so i can share it with you guys. So whats your WILD GUESS thales?
From those pics, and they aren't great so this is also a guess, they look like bandensis or something similar. Which prolly means 17c is too cold for them. They also look large, so they are prolly towards the end of their life cycle. Again, both of these are guesses.
If the guys you bought them from said they were coldwater, they should be able to give you some sort of ID. I do hear a lot of mis ID stuff coming out of Japan.. They shipped some latimanus eggs as coldwater 'giant' cuttlefish eggs which isn't quite right.
I'm glad you switched diets. Even enriched FW fish or crustaceans are not right for cephs, the protein content is too low and the fat content too high. Cephs have a protein based metabolism and they need a lot of protein but they can't store or perhaps even properly digest the fat.
Thanks everyone for sharing your experiences i really appreciate it. Thales thanks for sharing your ceph website its really great. Im always staring at those little critters that you have kept in your farm.