Before I started making my Veggie Cubes (spinach, Cuke, yellow squash, zucchini and Garlic extract in a blender, poured into Ice Cube trays and the frozen) I used a plastic christmas ornament yard stake (upside down), wedged into the gravel and would spear slices onto it. I would alternate them so that they were off center. After the first couple of times doin this, they did get used to it and enjoyed having the fresh veggies. I will warn you though, if you have live plants in your tank, the CL's WILL get their FRESH veggies one way or the other......