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Algae will definitely be a problem in full sunlight. I'm not sure how much algae a very robust cleanup crew can eat around the clock, but that might be a partial solution to your algae problem.

I wonder if you grow them submersed and they reach the water line of the tank will they then grow above the water line to a good height in an attempt to reach the light. If so, you might get something edible from whatever is growing above the water line. Purely theoretical at this point. More experienced growers should be along soon hopefully.
 

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I was operating under the assumption of the sun as your main light source. If you used sunlight I believe your algae problems would only occur below the water line thus making that part inedible. If you switch artificial light then the submersed portion of the plant could very well be edible also.

One thing to consider is if you harvest the tops only you can just regrow and trim. No need to replant.
 

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Another idea is to try to grow it hydroponically.
 
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