A couple Assassin Snails are in there. Here's what I found on them (Unlike many familiar aquarium snails, the assassin snail lays eggs individually, in small, translucent, vaguely shield-shaped pouches. Both the pouch and the round center of the egg are light in color.). Malaysian Trumpets also, but they are livebearers. The "stuff" floats and is very light. No gummy feel or gelatinous residue. Thanks for the input.