My first day of mining when I received my Z9mini on 6th Sept was 0.08802152 ZEC
Today I could only get 0.05651347... 35% drop in 2 weeks!!!

I am mining on ProHashing, on ViaBTC I got 0.06173636 ZEC as yesterday.

Current Zcash Difficulty: 29,539,436.77081280
1 Day Difficulty Change: 21.18 %
7 Day Difficulty Change: 38.96 %
30 Day Difficulty Change: 114.18 %
90 Day Difficulty Change: 190.07 %

09/18/2018   26,225,998.94755589
09/17/2018   24,377,050.14663627
09/16/2018   23,399,996.64078408
09/15/2018   22,815,394.89863244
09/14/2018   24,035,440.54764720
09/13/2018   21,230,564.33161569
09/12/2018   20,883,688.62658165
09/11/2018   21,256,976.24139297
09/10/2018   18,710,126.29127313
09/09/2018   18,273,529.52193197
09/08/2018   18,046,376.01809682
09/07/2018   17,380,188.74571841
09/06/2018   16,795,519.42086974
Source: https://www.coinwarz.com/difficulty-charts/zcash-difficulty-chart

For those who have not received batch 2 is in danger...
Another Never ROI miner is born ... 

Bottom line: If you are lucky one who bought the first batch and received at end of June then you are ROI now!
Second batch only shipped at end of August, and with shitty hashboard cannot overclock over 681M but first batch was overclocked to 750M!

WAKE UP!！ NO MORE PROFITABLE MINER NOW!!!