I have a 540 Gallon acrylic tank with all Vieja, a Midas, and a small Trimac. A big Manzanita stump in it and some Manzanita limbs, too. I really wanted 3-4 Royal Panaques and a Watermelon, but...it's acrylic. Would an Adonis would stay off the acrylic and not damage the tank? And will it eat at the surface? With the fish I have in this tank, pellets don't hit the bottom. Zucchini on a fork on the bottom, they all chase each other off it. A Pleco would have to be highly competitive for food in this tank, even come to the top for pellets. There's not a fruit or vegetable he wouldn't have to compete with Vieja for. Would a 3-4 inch Adonis work for me?