I disagree with this. My loaches had no sooner decimated all my plants with soft foliage including the Amazon swords. They will likely damage any plants if it fits their taste.
The only thing that I've seen them eat is decaying leaves. They never touch any of the plants. I have anacharis, cabomba, java moss, indian fern, temple, radicans, water sprite, wisteria, and dwarf sag and they don't touch any of them. How big were yours when they were "decimating" the plants? What was their diet? Mine love hikari sinking wafers. They chomp on them clicking the whole time. They like shrimp pellets, soft food (the frozen food substitute), and will snack on flakes and the color food, sometimes fd tubifex too.