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Ladipyg,
I specifically tried the "food juice" method with Tubastraea and Lobophyllia and saw no reaction to the "juice" in the water. My other tanks with fish effectively get "food juice" on a regular basis when I feed the fish and the corals don't appear to react. At the moment I'm happy to feed the way I do after lights out - and even with lights on in the tanks without fish.
tlmack,
You can use any meaty foods small enough to fit in the mouths of the corals. Things like mysids, minced prawn (shrimp), scallop or mussel, even minced fish would work well.
Those corals have symbiotic algae and so photosynthesis does provide for some of their requirements. It must be remembered, however, that photosynthesis only provides energy and they still need food to survive long term. Photosynthesis basically provides sugar. How long would you survive on sugar alone?
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ATJ
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