Indeed.
At the moment there is over 150TH/s pointed at NH but the price conditions are not meat so those rigs are mining on their backup pools. The current NH rate of 0.0099 BTC/TH/Day is 7% below mining with 100% pool luck "before" NH fees which have gone up to 3%. Thus the rate for SHA-256 power on NH must be at least 0.0105 for "some" of our rigs to mine there and above 0.0110 for all of the currently pointed rigs to mine there.
@boyd77gh take a look at https://bitcoinwisdom.com/bitcoin/difficulty (great reference site) to get an estimate on how much GHfarm should mine if we mine with 100% efficiency / pool luck in one shift.
With 500 TH/s we should be mining approx 5.2 BTC / day. Anything below means the farm underperformed, anything above means we did a good pool prediction / selection.
