My axolotl has strange behavior and fungus

Garret is my axolotl. He's the size of my index finger basically. I've had him for about 3 weeks. I give him blood worms only now because he doesn't seem to eat his pellets. I spot clean everyday- every second and water change every 5 days to a week. My water is very clean (except recently because of a drift wood log I had in there. Normal for it to turn tea coloured. Took it out anyways). He's had a fungus on one of his gills that has taken one off. The fungus fell off I took it out and he was fine for a while. He now has it again except on his foot. That has fallen off too now, and his foot is fine. I feel like a salt bath is too harsh for him at this stage but I don't know why it keeps happening. We marked the first one up to be from the stress of being in a new tank with the advice from a lady with one for 2 years. Since we have clean water, the temperature is ideal, I have a plant in there to absorb the nitrate, there was an ecosystem in there before I threw him into it. He should be healthy. I keep the lights off to refrain from extra stress aswell. I don't know why he keeps getting sick but I need it to stop. I just changed 70% of his water. It's clear now and he seems better.

He also seems to be "floating" at the top. He's not dead he will swim around and then stop and float and then sink to the bottom again. I don't know if this is normal or not. He also seems to have an undeveloped back leg. It doesn't look like others. Almost like it's broken? It was like that when I got him from the shop I assumed it would develop soon after since all of his other legs are functioning.

*to be noted: I am inexperienced, and I'm not sure that garret is even a boy*

Re: My axololt has strange behavior and fungus

I have the same problem with the fungus as well so gonna follow this thread ! For mine it looks like the gills (the little hair) fall at the same time.. Does that happen to you as well ?