Bought this little chap yesterday for my tank that is infested with black beard algae, but is he a true SAE? the tank he was in was labelled Siamese Flying Foxes!
kinda hard to tell from the pic, but the difference is in how far the dark line extends back. the dark line keeps going into the tailfin in kallopterus(flying fox). it stops at the base of the tail in siamensis(siamese algae eater).
I always thought it was the other way around? the dark line extends into the tail of the Siamese Algae Eater, and not the flying fox? the dark stripe does extend into the tail of this one, it was in a tank labelled Siamese Flying Foxes and when I said to the chap could I have a Siamese Algae Eater he did say flying fox! but to me it IS a true algae eater going by all the research I've done online but it is confusing, no wonder people find it difficult to find one
after looking at your pics, and the description, i think your fish is a true sae indeed. notice that the dark mark does go into the tail(like the flying fox), but sharpening into a point at the end of the tailfin. seems like no matter how much i think know, i learn something new everyday.