When I first got my Hammer and Duncan they were much smaller. As time went by they well they grew. Now when extended they can touch. I'm still learning what can be close and what can't. Will they hurt each other?
Yes a hammer coral can and most likely will put out sweeper tentacles which will kill the Duncan. I would give yourself at least 3 4 inches between the hammer and other corals
It's definitely time to move the Duncan. Frogspawn would be a good choice for that spot, the rule of thumb is euphyllia won't bother each other, but everyone seems to be wary of torches.
The hammer is already stinging your duncan, lightly for now but it can just decide to nuke it one day. If you have a frogspawn then it and the hammer can touch though.
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