Hi all! I have just set up my first tank and am planning to introduce Malawis, the favorites chosen are yellow labs- Lions Cove 1, mainganos, red estherea, Metriaclima callainos and Pseudotropheus saulosi. The tank has been running for 11 days and at this point the readings seem ok. How long do these readings have to remain constant before the fish can be introduced. Advice would be very much appreciated and many thanks in advance to anyone who responds, Teddy 