Re: chemical burn?
When you use regular fertilizers in a hydroponic set-up it is alos easy to over-fertilize and this can cause nutrient lock-out where the plant will no longer absorb nutrients. I did that once and most of the plants died (Colocasias) but a few survived. I removed all the substrate from the roots and soaked them in regular water and planted them without any fertilizer and eventually they grew the tiniest bit and amazingly over-wintered in the ground as tiny plants (basically zero growth all season from starts) and they grew fine the next year.
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