wolfen
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small pea gravel of mixed sizes are your best bet to use, don't use aquarium ornamental gravel as it is course and porous.I don't think he's dying but he does seem uncomfortable and short on gastroliths. The gravel substrate is going to be your best bet to help him out.
it needs to be mixed sized so the axolotl can choose which size it wants and is able to pass it.
it isn't guaranteed to work as your axolotl might choose not to swallow any, but it is probably the best chance to stop the floating issue.
just put a small pile in the container with your axolotl.