Hey,
For the past few days the mining difficulty has increased. I'm mining Zcash and the value went from 9$+/day per GTX 1080 TI to 6.5$/day.
Is this normal or will the difficulty continue to increase?

Thanks !
i am sure that the difficulty will be increase more like bitcoin mining. this is what you need to thinking before you start your own mining hardware and you should know this. i think soon the difficulty of the coins will be increase again and if finally you think that mining is not profitable again for you, then you need to stop the mining and don't mining again.