Is algae harmful to my plants, if so what can I do to get rid of it?

Not really. One method of curing this is to use plastic sheet covers. This is an easy solution if you are having an algae problem. The coco coir roles work great in the tray. Coir mats are reusable if you clean them. If you are worried about the algae right now, relax, it does not usually create a huge problem. But if you want to clean it immediately use a Tablespoon of 35% hydrogen peroxide in a gallon of water. Fill a spray bottle with the solution and spray the tray (its fine if the plants are in it).

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