Hi malawiscuba,I'm currently dosing macros and micros twice a week
It would help to know specifically what ferts you are dosing, how much of each, and what size aquarium are we talking about.
Also please tell us about your light (LED or tube) wattage, and photoperiod.
Lastly do you test your water, if so what do you test and what are the readings?
More information will help us determine the most likely cause(s).