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Much as Karen suggested, I use a powerhead and aeration(use the venturi on the powerhead) and aim it across the rocks, flat slate works best IME.

This will grow a nice bright alga call Pithophora.
This is a very tasty green algae. Over feeding the fish tank with lgae wafers will help grow the algae while also providing food for the fish.

While lots of light is nice, you will only want algae to grow in certain places, not on the glass etc, just the rocks.

So a very focused small are near the center of the tank would be best and pull the lights away from the sides and front/back of the tank.

Tom Barr
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