I'm on the same boat. My bigger mono only eats shrimp aswell as the Ven Orino. My smallest Peru Mono only eats sliversides. So my Peru mono is catching up to my 7'' orino. So to answer your question, try and feed the smaller monos diffrent foods other then feeding the same food as the bigger bass. OR, you can put the smaller monos in a grow out tank and power feed them.