I have been feeding my octos frozen shrimp from the market and they have been taking and eating them readily. I did catch some local crabs, thinking I would give them a treat, but I am concerned. If they like the crabs too much, will they stop eating the shrimp? I don't have the means to get them enough crabs (and of the right size) to feed them regularly. I also need to use shrimp bits for my experiment. Should I try the crabs? Or should I not to make sure they'll still eat the shrimp?