Yeah man. That F'ing PH. I used to grow with my friend on his terrace for years, in soil. The only worries/problems we ever had was 1) Forgetting to, or under watering, easily fixed. Or, 2) his mom would try to usurp/sneek our long awaited harvest. This is the first time that i'm growing since his mom's death (5 years ago), and i'm doing dwc. That damn ph flux can be the root of many problems. **See grow faq**
Good luck. I think your shit should bounce back. Me. I currently have alot of diff. probs to sort out today. Live and learn. At least I came up with a better system.
Also, they may be annoying for DWC. Only bc they are all separate. But, I'm changing from my current 6 plant DWC veg tank, which is communal, into individual bubblers. I think that this will help to prevent alot of communal probs. FYI, the cost of ind. bubblers aren't really too high. I discovered that the large soup containers that you get from chinese food take out work great.
Once again. Good luck. To bad you can't get all your supplies in english.

Sprout out

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[SIGPIC]Planting the seeds of destruction. One by one.