It is not uncommon to get a stream of bubbles from a damaged leaf, this has something to do with internal gaseous exchange. I know this was covered in another post a few days ago, but cant seem to find it... Is it bad, depends... Not uncommon to see on pruned plants and a bad leaf hear and there... Should the damaged leaves continue, could be a issue, either something damaging the leaves or lack of a specific nutrient...
Pearling is similar, but you will notice the bubbles forming under the leaves...
120g, Flourite & Sand. DIY Stand and Canopy. CF lighting 3wpg, Pressurized C02, DIY reactor. 2-XP3's, 500watt heater.
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