Headshape isn't right for L129 tho', is it?
You're right. It doesn't appear to be.
The original fish in the first post is an adult and NOT a juvenile.
I would agree with that. Young fish also don't tend to show that broken line pattern either.
It's either a young L66 or a 399
I don't know what L399 looks like. It's not in my copy of DATZ or Aqualog. Can't find any pics in the forum either. Anyone have any?
With a bit more investigation, and having got my pleco ID eye back in....
I reckon it's too squat to be L066, which is usually a more elongated fish with a more lyrate tail.
It seems to be the wrong colour for L333, which tends to be more yellow (could be the photos).
I think it's L318.
To be more confident, we will need bigger dead-straight-on photos from the side and the top, plus total length in mm.
These fish are usually £30+ by the way!