Quote Originally Posted by Tommygirl
When I took the top off I found a strange thing. The juice had a mild froth. I know that it shouldn't because the last time I opened it up to change out the juice for fresh there was no sign of anything like that. I don't know what the froth means, unless the juice was fermenting or something like that. Maybe one of you old hands would be able to tell me. I suspect that whatever was causing the froth is a very bad thing for the plants, and was probably aided in growth by light that was getting into the resivoir through the unused growing pots. Whatever it is has surely throughrouly saturated the rockwool cubes my babies are growing in, so I also rinsed the rockwool, rocks, and roots as best as I could. I'm hoping that the rockwool and rocks will completely flushed of the contaminant by the tubes that bring the water up to the plants. I also now have the unused pots covered so that as little light as possible can get in.
I'm no expert, nor am i an experienced grower but i'm thinking that your "froth" is algae due to the unused pots exposing the water. From what i've learned so far, you need to keep your water between 68-72 (although i have read a few posts that say 65-75 but I'll stick with the one that has less room for error) and let absolutely no light into the res.

As far as the algae on the rockwool, I have no clue on how completely get rid of it. But, as i understand rockwool is very suseptable to algae, so you want it covered from light aswell.

This i could be wrong about but I think a little H202 (hydrogen peroxide, the weak stuff i think its used for cooking, not the stuff for cleaning scrapes and burns) will help clean up res.

http://boards.cannabis.com/showthread.php?t=79230

you might find that link useful, for h202
blaze on