Top leaf tips burnt

the tips could be burning, but the side leaves look like magnesium or early potassium deficiencies. If your using the bloom micro grow nutes like in your diary have you been monitoring the EC and PPM numbers? and have you measured the runoff PH? I see you PH your water to 6 with coir as your medium, the liquid nutrients PH range is between 5.5-6.2 could try dropping that down to 5.8 and see how they handle it. If the coir was not buffered before hand it will need a infusion of calcium and magnesium. some coir companies prebuffer it and this step is not needed. Best of luck