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mussels and oysters life in the tank. The molly for 1 night, haven't seen it afterwards, but don't think to octo got it. I had a molly in there before but they seem to have problems with the night (to many critters around).
The peeled shrimp was in there for one night, afterwhich I removed it.
The crabs have been in the tank since yesterday.
I do see skins of these amphipods flooting around once in a while, so they are in the tank, but I don't know how many, since I haven't seen any alife. Do you think I should worry about it not eating, although I have food available?
id like to see an octopus eat every second day but its hard to tell what yours may or may not be eating.
I have in the past tied a live crab to fishing line (not easy ) and left it near the front all night and see if it gets eaten or try a piece of shrimp on a line and dangle it near the octopus as if its alive
Any luck yet? Aculeatus in the wild tend to break crabs/shrimps/stomatopods apart a bit when they feed, so chances are the amphipod exoskeletons in the tank are molts rather than table-scraps. It's possible it did eat the fish if you haven't seen it around the tank lately. Sometimes when they eat minnows or gobies they don't leave anything behind. Worth another try. The best luck I've had is with live crabs (de-clawed if the octo is old or seems tired/losing coordination). Was the shrimp you gave it still cold? If it still has a desire to feed, by now it should be pretty hungry, so it might be worth trying again with a small (about 1 cm cube) piece of thawed shrimp (shell on) if you don't have crabs or more fish. Pierce it on a small piece of wire on a small stick (so the octo can pull it off) and gently touch the suckers with the shrimp so the octo can taste it. If it pushes it away after all this time not feeding, chances are it's really not hungry.