I was just going to post that anyone feeding insects needs to be extremely careful. yes, lady bugs can be toxic, ants can sting long after they have been eaten and can cause serious swelling in the intestinal tract that can lead to further damage if an infection sets in. Krill is a great treat as it also supposedly promotes deeper red beni in some koi. ( Not sure if that is a fact or not but some claim it is true.) ?? I stick to melons, dew, cantaloupe, watermelons, also cucumbers, zucchini, yellow squash, English peas, oranges, lemons, grapefruit, cheerios, reg. and honey nut, earthworms, and krill. Strawberries and Blue berries I can see where they would enjoy but from what I have been informed they aren't the best of choices. Koi can't digest seeds of any type. The small seeds can actually cause blockage in the intestinal tract and cause to koi to bloat.
My Mom had a stomach condition that the seeds of small fruits, (strawberries, blueberries, tomatoes, Etc.) would cause her serious problems and infections. I watched her for so many years try and pick seeds out as she loved eating all of them but eventually she had to stop eating them due to the problems they caused. I guess that's why I'm particularly funny about allowing any seeds in the pond. I sure don't want to see my koi suffer like my mom did when she ate them.