Hi littlefoot, i cant tell you what alpha pellets are made from as i dont know lol, all i know is that its not a natural substrate, as no tortoises would come across this in the wild. if the pellets come in contact with water wee etc then it will go sloppy and mushy which can cause mold spores etc which isnt good for any tortie, also mentioned they are high in protien if eaten. The most natural substrate to use would be a mix of top soil and childrens playsand, but as mentioned horsfields LOVE to dig so best to have a deep substrate which you can acheive due to your high walls in your table.
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Linz
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