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Common pleco. Up to 24 inches long. Minimum tank size, 125 gallons in a community tank, 55 gallons EACH if they are alone. that's my mini common pleco profile for ya!
the darker one is a common for sure, the other, is a common also, some are really dark, like my old one, some, more lighter.. btw, tank upgrade... even my 55 gallon couldnt handle one.
if you cant upgrade, there are species that will max out at that size, like the hard working bristlenose and the driftwood eating clown pleco, i have both in two seperate tanks..
www.planetcatfish.com may help with an actual ID. Good luck. The important thing to note is that there is no way you can house them for life in that tank. Most ancistrus (see link) would be a way better option. They are tough to rehome when larger as well.