Last night the power went out for about 3 to 4 hours. I didn't think anything of it as the tanks started fine. Today, I fed Gimpy, and he was still out pacing like he wanted more food. Squirting water up at the hood, knocking the magnet off everytime I fixed it. I finally checked my ammonia and it had risen to .50. I really believe Gimp was trying to tell me the water was going bad. This is the second time he has done everything is his power to get my attention. After I did a 1/2 waterchange, he settled down to normal behavior and now has retired to his den to rest. I think it is so important for octo owners to be aware of what is considered the norm for thier particular pet so should their behavior be off even a little bit that gives the heads up something could be in the early stages of going wrong with the tank.