I did get some pest snails, which I suspect came from the Java Fern log, a later addition to the tank... I just picked 'em out as they appeared, none were very big at all... Over time, I kept seeing less and less of them... The last one I saw must have been at least a full week - maybe a tad more - since seeing the last before that... I'm fairly confident that there's not likely to be an explosion of them, for now at least, and will keep taking them out if/when I see another... At the rate of appearance, I don't actually mind them so much to be honest, it's just the notion that taking your eye off the ball could result in dozens of the little blighters...
Talking of snails, I do have the three Rabbit snails, one a little bambina, and would like to add another snail but this time not another Rabbit... The one that sounds ideal as a good solid detritivore would be the Black Helmet Nerite, but I am so put off by the sesame seed eggs you tend to get with Nerites... Other options include Faunus snails, I especially like the Cappuccino variety, but can't seem to find much info on these great looking snails, beyond some basics...