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I would use "sunleaves" or index cards with holes for the algae. If you keep the light off the bare medium the algae will go away and stay there. I noticed that once the plants start using a decent amount of water the algae is a non-issue (I think the medium's surface isn't wet long enough.).
I used peroxide in the beginning to oxygenate the "water" and ward off disease. The literature seems 50-50 for and against it. I stopped after I ran out a couple grows into it and saw no difference without it. Just thought I'd add my input.
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