There is no 'at least'. And there are no multi-algo pools.
There are pools with different algos which go offline if they are not profitable.
So you must configure all 4xxx pools for nicehash in order to get this to work.
Tho, check nicehash thread, apparently they ban by IP for 'hacking'..
Yes, of course I mean all nicehash pools for different algos. I have set stratum+tcp://stratum.nicehash.com:4333, stratum+tcp://stratum.nicehash.com:4335, stratum+tcp://stratum.nicehash.com:4336, stratum+tcp://stratum.nicehash.com:4337 and stratum+tcp://stratum.nicehash.com:4338 as pools, with no backup because I just wanted to check if it works but it looks like there's no work on neither one of these pools. However when I use same pools with 33xx instead of 43xx, they work. So is it possible that for example stratum+tcp://stratum.nicehash.com:3333 which is a port for scrypt algo works, but 4333 does not work?