To answer the question regarding hardiness,
IME with both juvi's (of which I currently have 4) and adults (of which I currently have two), they are definitely in favor of excellent water conditions, especially
ph.
Their diet really requires veggie matter, more so than other plec's. In addition to algae disks, broccoli stems (save the rosettes for yourself), zucchini, etc. are readily accepted. Don't forget driftwood. They love rasping on it.
BTW - ABN's go for @ $30.00 around these parts and are hard to come by.