Hello. I've noticed recently noticed that my shrimp have been eating my mayaca and hygro plants. They are stripping off the leaves. I feed them carrots, zucchini, and algae tabs a couple times a week. I'm watching some of them sitting on a slice of zucchini right next to the mayaca that's covered in them. It's like they prefer the mayaca. :/ Any thoughts or suggestions on how to keep them off? Thanks!