Aquaponic Gardening

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My GB is only half full (about 6") of growstones. The top layer is covered with what appears to be black algae or really dark green algae. I am going to finish filling the bed with Hydroton. Can I just add the Hydroton or do I need to remove the surface layer of stones first?

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If you cover it up, the algae should just die from lack of light. You might have a little extra ammonia temporarily appearing in your system, but I don't think it'll be a problem.

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