I don't think starving an apple snail is a good means of control. I just pull their clutches. They are laid underwater and are easy to remove although they lay them prolifically. I like the spixis alot, they are very cute snails. They did not munch the majority of my plants, but did nibble on some, usually by the substrate causing leaves to break free. I wasn't tryign to deter you from them, merely give you a heads up in case do you notice any of your plants not doing well. I don't consider them to be plant eaters but more opportunistic than most of my other snails. I feed them a calcium rich diet to maintain their health just like i do my bridgesii.