I did forget to ask about the fertilizer you use, as well. If you are providing a higher nitrogen fertilizer, it will mainly produce leaves. They will be green, and with too much they become a shining waxy green and begin yellowing and browning on the tips. This is definitely a cause for a heavy flush with water, let it recover for a week and balance the nutrients after. With the soilless mixes, you would want to flush several times since the water will pass through so quickly (same as watering them).
I did forget to ask about the fertilizer you use, as well. If you are providing a higher nitrogen fertilizer, it will mainly produce leaves. They will be green, and with too much they become a shining waxy green and begin yellowing and browning on the tips. This is definitely a cause for a heavy flush with water, let it recover for a week and balance the nutrients after. With the soilless mixes, you would want to flush several times since the water will pass through so quickly (same as watering them).