Have you been snorting the CSM+B again???
This article makes mention of allergies, but not directly related to the tank or plants but from mold that occurs outside of the tank:
The Open Aquarium, by Claus Christensen
This article makes mention of allergies to aquatic plants that pollenate:
Water Garden News Magazine
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Sol
90gal non-planted - gone - It sprung a leak and shattered
10gal planted hex - 6 neons, lots of RCS, a few CRS, 3 Ottos, oogles of snails
3gal nano - 100+ CRS, Red Ramshorn Snails
Questions about dosing nano tanks? Please
see this thread.