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ah, fab! You can see the sealed glass lip on the right side very well (lust under the surface of the water). Works very well for causing a rolling action to the water for tumbling Radiolarian, Chaetomorpha etc... reduces the qty of light needed, stimulates vigor/growth in such algae, etc.
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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