First let me apologize for the quality of the pictures. They are taken with my n900 since I do not own a camera. To compromise I tried to take shots from different angles to help see the problem better.
The portion of the leave with tentacles on some of the leaves has turned brown as can be seen in the pictures. Some of the leaves started to turn brown and dry out even before they fully uncurled.
The plants are grown using the tray method and are about 6 months old (including the germination period).
The plants are grown about 6" under 4x32W 48" T8 lights (2x 5000 2x 6500) 16 hours photo-period.
The temperature varies from 75F to 85+F but stays in 85+F about 80% of the time.
Humidity in the room varies from 50 to 70% mostly staying closer to 70% and only very rarely dropping to 40%.
Is it the endosymbiotic fungus issue known to be associated with these plants?
P.S. hmm could it be the fact that the plants are in a 2.5" tall pots in about 1cm in water... Sundewman (CPlantaholic) suggests 4" pots to prevent the flooding of the roots..