Are you sure that's a flying fox. It looks like a true SAE to me. Of course, I could be wrong.
Awesome tank you have
SAE stands for Siamese Algae Eater, they look a lot like flying foxes, but are much less territorial, and one of the best algae eating fish in the hobby!
For more info check this site out:
http/www.thekrib.com/Fish/Algae-Eaters/
The picture that you have of the fish looks a lot like an SAE. I'm 99.99% sure its an SAE