Why would you want a Pleco bigger then 5-6 inches? All they do is Poop more and don't clean algea better either then a 5 inch bristlenose pleco. Big plecos make way to much waste and get lazier the bigger they get.
The reason why so many people have BN's is that they do the best job. and the common is available in any chain store you go 2 even though they perform poor in cleaning algea once they get bigger. You can also check out www.planetcatfish.com for tons of different Plecos.
I have a "Headspotted albinus" in my 135 gallon...and all he does is eat algae off the rocks, i want him to eat it off the glass...so i would recommend him for rock cleaning.
he looks similar to this here...i've found them listed as L148
well i already own a rubbernose,its actually in the african tank right now. But he is going back into one of my other tanks.They also don't get as big as i would like.
IME, common Pleco and Sailfin Pleco do the best job in cleaning algae off the glass and they are very hardy as I have yet lost a single one. But they grow too fast and when they reach 6+ inch, they will start to attack fish and I ended up trading them away when they exceed the safe size. Bristle Nose don't grow as large and are very docile. They do a decent job but not as thorough as Salifin or Common Plecos in cleaning algae. Clown pleco is a poor algae eater. I tried other plecos in African tanks but either they don't make it or did a lousy job in cleaning algae.
Some people on teh planetcatifhs.com forum said to try the rusty pleco(L077/137) I have yet to see any around here but if i do this is the pleco i want.nice violet color and good size,plus they eat algae.