At week six of flower i'd be upping my numbers as well. 700-800 isn't anywhere near the 1350 my plants would be at that stage. (in fact....my plants would have been on more than 800ppm since about the fourth week of veg.....) I'm pretty sure that's where your low yield is coming from.

As for the ph dropping.....I'd be concerned for root rot etc as X-C says. You are late in your grow so it may be normal here to lose some roots (which can drop ph) but that's a fairly good drop.
Weedhound Reviewed by Weedhound on . Ph keeps dropping ...!!! help I started my grow in 8x8 inch pots on a 4x4 foot flood table ...when I switched to flower I also switched over to 5 gallon bubble buckets ....they grew very well after the 3-5 days it took for them to get over the transplant shock. But I have noticed my ph levels are propping drastically ...I just changed the nutes Saturday in the buckets and by Monday night the ph had gone from 5.8-6.1 to 5.3-5.1 and they had not had more than a 2-3 quarts of water ...im running flora nova grow at around Rating: 5