I have a LTA that has been in my tank for about 5 months. It's been eating well, until last month. Up until then, He'd eat the occasional flake that landed on him from the fish, plus a small chunk of defrosted fish. He'd grab the fish and pull it into his mouth. Lately, however, he doesn't seem to be doing well. He will react to the fish chunks being placed in his tentacles, but after a few seconds, he relaxes and lets it fall out. Could he be tired of what I'm giving him? I have to admit, the fish I'm giving him is from the grocery store; it's called "blue hake". I've no idea what kind of fish that is. Also, I store the fish in the freezer, but it's been in there at least 4 or 5 months. Maybe the fish has freezer burn, or it's the wrong kind of food for him. If this is not the best for him, what is?