Hello! So as the subject line reads, my RES, Marie, has taken to chewing on the rubber on her tank heater. She also has been nibbling her dock but she has done that for the past several years with no issues. I guess what I'm curious about is if this could mean she has some kind of nutritional deficiency or if this is just a sign of boredom? I've been throwing pretty decent sized chunks of cuttle bone in her tank to give her something else to gnaw on rather than the tank equipment, and she goes absolutely nuts on it. Is there anything else I should be taking into consideration other than boredom? I do believe she has a pretty well rounded diet. She gets fresh veggies, crickets, turtle pellets, shrimp/krill (as the occasional treat only!)...
Any ideas? Thanks in advance!

