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Originally Posted by sikabuyin
I still don't know if I need bubbles or not so I added h2o2 to make sure the roots get some o2.
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It's a bit of a judgment call. If enough of the water's surface is sufficiently agitated then you won't need an air stone. But from the look of it, you've only got a small area of the water's surface under agitation. You might want to go with an air stone just to be safe.
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The water temp is pretty steady at 77 - 78F which worries me. I have no clue as to how to lower it. My house is @70. The only thing I can think to do is add ice to water but would direct contact with ice mess up the roots. This would only be a temp fix anyway.
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77-78 isn't terrible, although it's definitely sub-optimal. Mr. GS and I have been talking about that in my current grow log. Neither of us is sure, but we believe that the warm water has a harder time holding enough oxygen for the plants. It's possible that adding extra air stones and/or surface agitation will compensate. Again - neither of us is completely sure. We're experimenting right now.
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I thought I could use a mini fridge to cool the water down by running the water circulation hose through it but that's a lot of work.
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Actually, it's not that hard at all. Just pick up some flexible tubing and some pvc connectors at your local hardware store. Then drill two holes into the body of the fridge and run the tubing through the holes, being sure to coil it several times inside the fridge. Use some silicone and/or epoxy to seal off the holes. Other than that you don't have to make any other modifications and the fridge runs normally. You can even use the extra space in it to store your beer
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