Interesting and unsure... #reefsquad get a closer/better picture or just pull it out and snap a photo than just make sure to cover your hands just in case its something that stings or bites... Most likely not but you never know!
#reefsquad Usually you can pull it out or scrape it out. Or you could use Blue Life Flux RX,, here there are diffrent types of treatment! Goodluck! Im sure the reefsquad will answer your lights question.