I have been using gravel for about 5-6 years. I have noticed on the forum that people like using sand. My axelotls are fine but one did eat a lot of gravel. So I got larger gravel and now it's fine.
Sand is usually recommended for axolotls because it is easy for them to pass should they swallow some. Large rocks that cannot be swallowed are also fine but have the disadvantage that debris is trapped underneath them making them more difficult to clean than sand. It therefore simply comes down to personal preference.
I have a very fine layer of small gravel and added bigger rocks through out the smaller gravel. When I vacumn the tank I move the bigger rocks and vacumn underneath them. Easy to do when cleaning the bottom of the tank. Why sand, I don't know. Matter of preference I think.
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