Yeah, I've researched and found they'll get to be as big as 2' sometimes, and live to be 20-30 years. It's pretty awesome, but I don't know if I have the time or funds to dedicate to taking care of him (and I agree--these fish shouldn't be sold, at least not so easily and without letting one know what they're getting into.)
I'm going to talk to my family, see if they would want the pleco to be a "family" pet, so everyone can pitch in to take care of it. I won't ask anyone to pay or anything.
Worst comes to worst, I'll look around and try to find him a home. Craiglist seems interesting, maybe I'll get some luck with it. :] Thanks!
Thanks guys for all the advice and help, I really appreciate it.
I'll watch videos on YouTube to try and learn how to properly use the vacuum (it's one of those that aren't battery powered, and I stirred the whole thing up horribly that it was cloudy for fifteen minutes before everything settled. D: ), and I'll definitely try making those water changes. Thanks for the tip on the filter - I'll remember not to clean it during a water change.
Even if I don't keep him, it's good to know these things. Next time, which will probably be a while from now (at least until I've graduated), it'll make for a much better experience, I think.