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OK will post pictures soonThe result can be - the same as before in the aquarium that have no light in the first experiment - because as you say - it is not likely there is many photosynthetic organism there and it will be the same as no light exp 1 when you put the light exposed (in test1) into the dark. If this happens - I´ll think that the indications about that photosynthetic organisms was active in your first test is very strong
Sincerely Lasse