Cyano is a bacteria that is reddish and slimy. Check your tank really good for your anemone sometimes the put themselves in weird little places like in a crack between 2 rocks. That doesn't look like anemone guts to me either more like cyano.
ReefCleaners.org | Clean Up Crews and Macro Algae - Nuisance Algae ID Guide
ReefCleaners.org | Clean Up Crews and Macro Algae - Nuisance Algae ID Guide