After adding two Lettuce Nudibrachs into my aquarium to deal with a Bryopsis Algae issue a day or so later I stumbled across this guy moving on the glass. Not sure but to me it looks like a baby Lettuce Nudibranch. Any thoughts?
It could be but I thought that they were greener. With nudibraches, I wouldn't risk it. Put them in a container until you get a definite ID in the morning.