just for good measure - it could be a nicely coloured 333...
L400's dont 'tend' to be as joined up as that... but there is Sssoooooo much variation and speculation about all these "new" black and white plecs its hard to say...
Its a beaut, whatever it is - Did they have any more? - I would have had to have 4 or 5 for a breeding project (yep - that would be another one!)
(Not sure what I'm going to do when I finally shut the shed down.... I'm down to 3 tanks out there as of tonight )