I'll try some different veggies and see. None of my Parrots like peas. I might just tear the ragged part off of the marimo and roll that into mini balls. Oddly enough Kong doesn't tear at the smaller marimo, he just rolls them around.He is laying that Marimo ball to waste. Let's me know to watch out for that the with my cichlids, and possibly my Dragons when my Marimo balls come in. I won't have to worry about it too much with my other tanks--maybe the loaches. What the hey--it's their toys
You might try chopped up chickweed, dandelion leaves, brocolli, or carrot tops to make the Marimo balls last longer. I found my cichlids like fresh greens as an occasional treat.
Two more pics of Boss aka "Sumo".
First pic he's flaring, showing his cheeks
Then a full side shot. He's hard to catch from the side because he likes everything in front of him. Gotta love that perfect ball shape.