Bizarre 🤔
My friend Gregory Oogle says: "The most common ways unwanted snails enter our aquariums accidentally are via eggs or juveniles hitchhiking on plants or decorations, or in gravel cultures transferred from one tank to another. Many snail eggs are transparent and are often attached to the undersides of plant leaves, making them difficult to see."
Sneaky little bastardlings
Funnily enough, there is a plant which isn't that he but the little lady did say that she thought there was an air bubble under one of the owners for ages. Maybe they were in it? Like a cyst!!!! Aargh!
No, too predictable.... Inter dimensional shape shifters from a parallel universe where the Snails rule... It has to be.
Aye, thats my preferred option. Never doubt that it was aliens!