Hello! Hope this find you well! I just add a new led grow light, the Maxsisun PB1500. I had to flush her 4 days ago. I notice that she was suffering some Potassium deficiency and made a decision base on salt build. The flushing was done with oh water around 6.5. And after three day I add a little nutrients of 1.1.3 to a bottle of water. And I also LST to spread her a little. This way the air form the fan can get in her middle colas.