Once you get the scope you will know for sure, but if youbused chemiclean and its still there then its probably dino. It looks like dino to me as well. The chemiclean probably killed the bacteria that was keeping the dino's in check. As a general rule i like chemiclean if u absolutely need it, but this is a possible side effect.
To me it looks like dinos but I would need a better picture to know for sure and I would definitely need closer picture to say what type of dino it is. They are treated differently so u need to figure out what type they are.