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From my experience...Grow your aiptasia in the dark. They're capable of photosynthesizing, but they don't need to... especially in a nutrient-rich environment. By eliminating light, you eliminate the advantage the algae have over the aiptasia.
Skip the UV sterilizer, as it'll kill any cast-off juvenile aiptasia. Instead, increase water movement within the tank. Give the aiptasia more varied surfaces to colonize, as well. Use plexiglass or acrylic to create surfaces on 45-degree and 30-degree angles, and ensure that water stirs on both sides of each surface. Aiptasia will colonize upside down as readily as upright.
Stress the system a bit by allowing temperature to fluctuate from low to high and back, but remain within temperate to tropical range. Aiptasia multiply as readily in response to environmental instabilite as they do to a food surplus.
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