It's a simple fact: water + nutrients + light = algae.
Eliminate any one and there will be no algae. As light through the container wall is the only viable choice, that absolutely will work.
I have often thought that an opaque pot having one of those vertical, translucent "windows" (like some chemical jugs) would be the ideal S/H pot - no algae, but you would still have a way to see the liquid level.
Any of you so concerned about algae that you'll contribute about $50,000 to help me buy the tooling necessary?
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