Looks very similar to the pics on pc :yes:Could it be Ancistrus pirareta LDA54? L book says they grow 16-18cm.
Thanks for that Gem, mine never caves either, he is a beauty though, I would love a female to go with him. Regards, BillI have one just like him, I have never had a positive ID on him, I was also told 'common' but with the honeycomb pattern and the shape mine certainly isn't. he's been retired to a 6ft heavy decorated tank so no chance of getting him out for further pics without dismantling the tank as he doesn't cave up.
I hope someone else can help
Cheers
Gem