I have some kind of jelly-like substance growing in patches on the glass. The patches are less than 1cm in diameter and have white dots inside. Can anyone tell me what it is? It looks kind of like minature frogspawn.
Sounds like snail eggs! If you like snails, as I do, leave them be and you will have a bunch of little snails in a couple of weeks or less. I guess it could be frog eggs as well, but less than one cm, I'd say snails.
So Gumbii. How do you know that's all the bigger they'll get? They could be any number of species of snail.
Rioboy. The question is: where did they come from? If you have snails in your tank already then it's obvious, but many times you get them with plants bought at the aquarium store.