I use a Tetra Whisper PF 10 filter.
I change 25-50% weekly and then I change everything every month and scrub the rocks, etc.
I use AquaSafe Plus to treat the water and this time I added a little bit of Stress Coat Plus.
I keep the light off on the tank because it is a LED light and is too bright for me so I figured it would be too bright for him. Sometimes when he is startled, he will have these "seizures" but that has only been twice. It is mainly when he comes up to the top of the tank when trying to eat. When he has been startled, it has been his whole body and then he darts around too. But when he comes up to eat, it is his front limbs. I also noticed tonight that he has been shedding a lot more than normal.
He just started looking a bit thinner today, but not too much. For the earthworms, can I get them at any pet store and they would be okay for him? I always thought about getting some for him but since he stopped eating I haven't tried.