This is my first try at feeding them a blanched veggy. What I dId was take a piece of lettuce & microwave it on high for 5 minutes in boiling water, after that I placed it in the tank but it still floated, so I put a wooden chopstick for temp to hold it down. After about 10 minutes I notice a few snails on the lettuce feeding & 7 shrimp on the wooden chopstick?