It's better not to cut off yellowing/dying leaves since the plant is still able to reabsorb all the nutrients from the dying leaf back into the plant. I let the leaves die off completely and then I just remove them. Also it would be interesting to see an update video with all the plants that you grew in leca and to know if it helped them or not, I'm kinda curious about growing plants in leca myself right now lol.
That's what I was thinking too! I will definitely do an update video. I have had good luck so far. I wish I would have done a video when I started them all. TFW!