Just some quick questions around these plecos. It's said that they are hard to tell a difference on, but is it?
From what I can tell the demantoides is also known as L200 «high fin» and then my guess would be that this is a «high fin» also known as demantoides

Mowing on to the subviridis witch doesn't have a high fin, and then in my opinion should look like this:

As you can see the dorsal fin on the first pic is higher and not sort of pointing backwards as it does in the second pic
Now am I wrong and it ain't that easy? Does it just depend on the quality of the fish?