yes. unless the plants are well rooted, some of your plants may start floating. you should have a nice thick layer of gravel.
they for some reason have a rep for destroying plants, but ive had many over the last few years, that i keep trading in for smaller ones, and ive never had a problem with them eating plants. :bounce: ... Thankfully. :lol:
Also, give them lots of driftwood to hide in and rasp off, and they will leave your plants alone.