FWIW I've found that certain LPS families just cannot take my radions either. Chalices, most brains, scolies, etc... no go in my tank. They bleach to death rapidly wherever light hits them directly. Elegance corals, frogspawns, and *some* acans do ok. The funny thing is that under a Kessil ocean blue in my pico tank, all my brains recovered beautifully, got back their super deep, rich reds and greens. That fixture is LED, but it has no red or green diodes, and the mixture of blue to white is completely different, which might be the reason
In any case I'd likely try T5s on a smaller tank in the future.
Have you had any corals that have morphed in an unappealing way under the halides?
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