When ever I have had a tip die I have fragged the colony to make sure what has happened does not spread. This is just a precaution and I have never read anywhere that one should do it. Once when I did not frag I continued to loose more heads, so I concluded to separate the heads as soon as possible. I would also move them lower as this could be the problem, then slowly increase the light by moving them higher in the tank if this is where you want them. They can adapt to many different levels of light, just don't shock them by increasing it too quickly.
You can put them close to a frogspawn and hammer as they are in the same family and should not bother each other. Good luck
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