I am not sure what is wrong with our Hannibal...
I still have him in his 3.5 gallon tank. His water is about 75*F and doesn't change more than a degree or two. His filter is still working and he only has his hairgrass plant in there with him.
I noticed something wrong last night. He has a white spot on his tail at the tip. Last night it was just a spot. Today it's a little bigger. At first, I thought maybe he was getting some of his pretty white-blue on the ends... But it is only the one spot and it is white.
I also noticed that his right gill flap (?) is sticking out a little. I noticed this because it was moving as he swam and with the slight current from his filter. I find this odd. Especially as he does not flare. Ever.
He is also having more trouble eating. I gave him his freeze-dried blood worms (the store hasn't had mini pellets for us to try and they seem to not carry flakes) which he is a glutton for. He does not play with his food when eating the blood worms. Last night, however, he kept spitting them out. A couple times he seemed to get one down only to spit it back up. He did eventually get a couple down and keep them down.
He's acting like his normal self still. Takes full advantage of the room his tank gives him. He isn't clamped at all. Still shows off his pretty fins and the fact his dorsal has new growth.