Dragon is correct. I may be off the spelling but bare with me.
The common "bristlenose" is actually an Ancistrus sp. catfish, not in Plecostomus family. That partially explains why they have different traits. Ancistrus cats GENERALLY don't grow nearly as large, and they are mostly vegetarian; plecos will eat fish eggs and young if you have them. IMO - they are much more efficent at algae removal, and they don't have they destructive outburts both of the plecos I had were prone to do. Mine just about tore everything up a couple of times.
That being said I think the bristlnose Ancistrus sounds perfect for your tank. They seem to do well with surface algae on the glass, rocks and wood. If you have hair or BBA, then the SAE's are the ticket. However, I have no experience with them in hard, high Ph water. The only thing with them is that if you have a lot of algae they grow fast, I have seen them grow to 5"!! Also, as they get older and fatter they seem less intersted in the algae and more in the food your are feeding to other fish.