Thank you for your reply. About MMs - the only context that I've stumbled on related to MM's has always been negative (manipulating prices), but that's also a good point, that they provide liquidity. Some people blame algos. Are algos same as MMs? MMs use algos? Just read an article about Jane Street.
Found the Level 2 market data in ihub now. Thanks. I think I will have to subscribe to that at some point. I'm using IB atm.