If it is an Ancistrus dolichopterus(L183) it prefers a softer and warmer water than the Ancistrus sp3.
Bristlenose Catfish need driftwood in the tank as lignin forms an essential part of their diet. They may become prone to stomach disorders (blockages in intestines can lead to bloat) if fed too much animal protein. Feeding fresh vegetables is important - zucchini/cucumbers are usually a favourite.
this topic has gotten a little mixed up the pleco in q is now in the planted tank the malawi question related to a common pleco who i have now sold along with the idea of getting another tank as another large tank mainly for the benefit of housing a common pleco that i've had from 1inch
the small pleco will be well fed in my planted tank as it has wood and i provide vegatables for the benefit of the flying foxes and mollies as for its exact type i'm completely un concerened as long as i'm dealing with something thats not going to get to ecssive size it behaves and looks nice