I recently moved a bleached and dieing caulastrea from the bottom of my 50 gal which is lit by a single 250W 10K MH to my 20gal which has a 24" Hagen Glo with Life Glo and Power Glo bulbs. Almost immediately the coral stopped receding and regained its former color. Now it looks like it will make a slow recovery.
However on the flip side a friend of mine in town switched his 500gal which used to be lit with four 400W 20K XM to all T5 and had nearly all of his SPS near the surface bleach at first.
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