Personally, I like chinese algae eaters. They never seem to stop moving and don't grow as fast as a pleco. I've had pleco's and they definitely add an interesting look to an aquarium, but I've had to trade in two of them because they grew too large for the tank.
Good luck and have fun setting up you aquarium!!
A common pleco can get 24 inches. I had one in a 75 gal that got to 18 inches and gave him to the local aquarium. There are smaller plecos though that can work just as well, like bristlenose, clown plecos, and such. In fact there are 100's of species to choose from, but finding some can be a problem and can get rather expensive.
What I'm saying is, what do you do with them when they get to big for most aquariums? I can't imagine there is a big market for those over 18 inches long? What are people doing with them when they get too big?
You'd actually be surprised that people have larger tanks and take them in. I'd be willing to say that most LFSs will be willing to assist. Other than that, there are rescue groups out there that will do the same.
The problem really is solving the algae problem rather than calling in a "clean up" crew to do the work for you. Several factors weigh in like aggressiveness (CAE), size (most plecs) to care (Otos). Sure they do a good job, but when the job is done, then we as care givers need to step in and give them that extra attention for them to survive.
It really boils down to "What do you want to have in your tank?". The tank size is the determining factor.
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