I have some dark spots on one of my plants and on one of the decorations, Is this algae?
Does it rub off? If so, then yes it's brown algae (diatoms).
Yeah it rubs off. Is it bad?
No, it's very common in new tanks. You can just rub them off. A couple of nerite snails would gladly eat them for you as well.
Oh yeah I might pick those up soon, thanks for reminding me. BTW the hitchhiking snail is nowhere to be seen, so I don't know own where it went.
Guess what? The hitchhiking snail just appeared outta nowhere and is just chilling on the side of the glass.