Bacteria in their tissues photosynthesize then share the energy they make with the coral in exchange for being protected within the corals tissues. This all means corals need very good light, actinics and halides, which means lotsa money on lighting. It's worth it though.
Mmm in my house I don't take care of the additives, so I'll leave that up to someone else to explain in more detail.
Anyways my favorites are probably pulsing xenia and star polyps.
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