A species of Acochlidiidae snail maybe?
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Whatever it is... remove promptly and kill it with fire! Preferable dragon fire but I suppose any fire will do.
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Fungused food! Just used a fish net and food fell out! Phew! Glad it's gone! The fish hurried to eat the food inside. You know how lazy bettas and gudgeons can be about eating, so I doubt they even saw it. Mystery solved!
I've always wanted to keep a Betta with my GBR! Do they get in any conflict?
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