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I just happen to have one of these beautiful fish newhobbist. From what I've read, they can get over 18". Of course, this depends on a lot of factors regarding their environment. They are certainly not "dward" in any way. They will gnaw at algae, but they will not make it their daily diet. You can supplement it with algae wafers, lettuce and their all time favorite! Zucchini:'
The little one is an abino bristlenose, a dwarf variety.
I also own a Gibbicep pleco and they are truely beautiful pleco's. They can get rather large so should be in a 55+ tank, but take a while to get big. I've had mine for about 8 months now and he's only grown maybe an inch and a half. Then again, I got him as a baby.
I've had mine for about a year and a half and he hasn't grown all that much, but he really does the job for algae. I keep him in a 55 gallon but plan to upgrade eventually to at least a 75 gallon. I'll probably go larger though, IMO a 75 gallon would be the minimum for a grown gibbiceps. If you're looking for one for the 72 gallon in your sig, you could probably keep it if you step up your filtration- these guys are messy!