Hi,
To be honest no. I was doing some mainitenance one day removed the tank hood and found a cluster of eggs. Took me by surprise. I replaced the lid and looked a couple of days later to see if they were still there and there was another batch. I remember posting on here about them and had a lot of interest from various members. You will probably get more responses tonight when people are at home and not at work. I dont know if anyone else knows if you can tell. There is a post going around at the moment which has pics of egg clusters etc. The post is called 'Found an Apple Snail Clutch' by Lynz781. Have a look at that and you will get the right idea.
Richard