Moving the plants back where they should be. Goldfish are inquisitive fish and they push things and whatnot sometimes. Shion isn't a large fish but I often see him pushing things or violently snatching at plant leaves... lol
He munches them AND sometimes just tears them up for fun. The key is finding plants he doesn't much care for. But honestly I don't mind if he has a munch... it's good for him and the plants are actually doing pretty good somehow. He is still a young and small fish, so he MAY become more destructive over time... but I hope not!!
Thank you BTW. Fancy goldfish have always been my favorites, but they are hard to care for and very hard to source healthy ones that I like the look of. I also have a 55 gallon with a tropical fish and I recently had guppies (never again) but I'll always love my little GMO fancy goldfish.