Chironex

Looks like a little wind burn or cooler night temps. But on the bright side, the new leaf looks good. Remember, the emerging leaf is affected by what happened a week or two before. So everything should be ok as long as they have the right amount of water. The tendency to is water, water, water when we see brown leaves. Resist that and feel the soil. If it has moisture and the dirt sticks to your finger, it does not need more water.
Keep an eye on the emerging leaf. If it begins to yellow or brown, it could mean that there is something else going on. Check for aphids or mites, etc. Check to be sure that you are giving it fertilizer in the proper proportions 20-5-30 and that it has the proper pH and micronutrients.

I would just say to watch it for a week and see how the new leaf does.

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Scot