You shoud be using no nutes for atleast 20 days, but the liquid karma is da shyt! i would suggest cleaning out your res often, alot of the organic nutes seems to solidify and sit at the bottom of the tank, the ppm's ussually remain the same, i dunno i herd that organics in aerated water can cause them to fall out. Just check up on them and make sure your water is primo always.

I wouldnt follow any schedualed nutes either, your plants will show u when they want more or less.