Is my axolotl too thin

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He’s not eating very well, he recovered from gill fungus and I feel like he’s starting to look really thin. I’ve been feeding him axolotl pellets and mini blood worms. Today I’m going to get black worms for him too because I know they’re more nutritious. I’m only feeding him the blood worms as well as pellets right now because he will not eat the pellets and my LFS was out of black worms. Any advice is appreciated!