you really should have at least an 8-10x magnifying glass. they're almost essential for checking trich's and useful for diagnosing other probs. and they don't cost much...got mine at ebay for 12 bucks incl s/h. radio shack sells pocket microscopes that are good for extra-close looks and are under 15 bucks...but the loupe or mag glass is a must-have, imho...

btw, i put mine into a "dry period" the last couple weeks before harvest...i cut way back on the water and give only enough to keep them from wilting. but i also quit all ferts 1 month before harvest then water normally for a couple weeks for the flush, which is varied according to the grower's use of ferts throughout the grow. i use very little (4 applications throughout the grow) so major flushing isn't needed.