Welcome J to the site - hard to tell on this but probably foreign matter or food stuff partially which has rotted down and thrown up . with tortoises once down then usually stays there as their gut / stomach is slightly different and doesn't predispose itself to throwing up. I would keep an eye on Flash and make sure doesn't lose weight - sure he is fine though from what you say...Horsfields eat fast and clear the plate usually so go slow with his food ...CB
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Horsfields, Spur Thighed, & Marginata
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