Big farms are just hashing and selling, hashing and selling.. no matter what.. and it's a constant selling pressure. If they manage to sell cloudmining tha maybe investors don't sell their mined btc, but if not than all mined ntc are on the exchanges I guess
i still think it is not farm fault, farms always existed in bitcoin world, and before was even worse because of the block reward at 50 btc, they are surely not the real reason for any big drop...
real reason is a combination of hacker/rich guy that bought when btc was young(now they are dumping), poors that can't buy other bitcoin and they are stuck at 600-1200 price, and others small factors
i would add that a red zone now would be considered sub 200, anything above is still a safe value for the btc price, in the sense that it shouldn't be seen as a big crash or whatever...,