looks like a phosphorous deficiency to me ... add a dose of Tiger Bloom to your solution in the reservoir, and mix a 1/2 strength spray bottle of same, for foliar feeding (spray both sides of the leaves, early in the 'morning' period, while the pores are open) ... the bad leaves will continue to look bad, but the plant will be OK ... that sure is a nice-looking plant, otherwise ... Mike breeds some great gear :thumbsup: