Quote:
Originally Posted by VaughnH
Doing the test in a single tank, with water mixing between the two areas would not be a good test. Algae could start up on one side, then move to the other in the water. Green water and GDA would migrate easily between the two halves. And, if the plants grew faster on one side than the other, you would have to be very careful to have very good water circulation back and forth between the halves or the faster growing side would deplete available nutrients for the other side. I think two separate tanks would be the only way to do this.
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Good point, I hadn't really thought about algae actually being in the water itself. I was thinking about doing it with no plants though, just a bare tank with water. If it worked and one side had less algae, you could disinfect the tank and swap sides with the lighting and try it again and see if the results were consistent based on the lighting after several trials. But if it didn't work, it still wouldn't be disproved, since perhaps the algae was just migrating etc. Lots of variables.