Jeff Posted March 29 Share Posted March 29 Link to comment Share on other sites More sharing options...
Guppysnail Posted March 29 Share Posted March 29 Very much looks like fish poo adhered to biofilm on the glass. Link to comment Share on other sites More sharing options...
MattyM Posted March 29 Share Posted March 29 Does it move on its own? Link to comment Share on other sites More sharing options...
Jeff Posted March 29 Author Share Posted March 29 No Link to comment Share on other sites More sharing options...
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