I find euphyllia really hard to keep happy over the long term. I have had a hammer start to recede in a tank with 10 other specimens that were all growing and happy. I took it out and put it in my frag tank, and the hammer came back and grew like a weed again. I am not sure what it was or wasn't getting in my DT. I now have a wall hammer that has been great for over a year start to recede and the trip to the frag tank has not halted its descent. They are just so picky. I almost think SPS are easier to keep happy over the long term.
Try iodine dips and keep your mg up. No direct flow and they don't need a lot of light. You will find that less light and flow brings them out of their skeleton a lot more. If they start to bleach, you have too much light. If the color is fine and they are retracting, try turning down the flow. If the actual tissue is receding from the skeleton, there is not much you can usually do especially if it's a wall.
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So many ideas, so little money!
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