Thanks for all the responses guys! Especially Tiki! It makes me feel really hopeful because it sounds like he & Sluggles are a lot alike! I have named him Artemis, Artie for short. It's for the Greek goddess, not Matrix.
He's doing ok, a small improvement today. When I feed him, I drop a few bloodworms in because it takes awhile for him to see them & go after them. I don't know if he has vision problems or just trying to get up the energy. I only let him have 1/2 a worm twice a day right now because otherwise he'll bloat so I remove the rest. But today, he was not pleased I was removing them. As I started to remove them he darted about an inch forward & sucked down the other 1/2 of the worm before I could take it out! Luckily he didn't bloat so I may move him up to 1 worm at night. I'm in the middle of a water change right now (I have to take a break because I'm still pretty weak myself) & when I 1st put the turkey baster in to start removing water he quickly (for him) swam/drag over to the coffee mug I put in there & hid under the part of the handle that touched the bottom of the tank. While I don't like causing him stress, I was pleased he made the effort to protect himself because he was didn't care during water changes previously.
@Sainthogan- I don't think he's constipated anymore. For some reason, the other 6 of my PetCo rescues always pass a large nugget their 1st poop with me, then they're fine. Maybe a build up of stuff because they're being starved so they pass a bunch when they're finally fed?
@Tiki- Thanks for your suggestions on water changes. I had a major brain fart & forgot about the turkey baster & the necessity of more frequent water changes since the water level is so low!!! I feel really guilty for forgetting something so obvious.
I wasn't able to do a water change this morning, so it's been almost exactly 24 hrs since the last change. I tested for ammonia in the tank & it was at .5! I removed 1/2 with the turkey baster & added some water treated with Prime only & now it's down to .25. I'm giving us both a short break, but will continue to remove 1/2 the water til it's at 0 & then do 50% changes twice a day which should help a ton. I'll let you guys know how he's doing tomorrow. It's going to be an uphill battle for this little guy is a fighter!