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Do you have strong aeration on the new tank? Seahorses have a less efficient gill structure that is not as good as most marine fish. As a result they need to be in tank's with good aeration. Putting an open airline is a good way to know that the tank is off gassing enough. A good protein skimmer also helps aerate the water.
If the new tank was not cycled and you are not doing daily water changes they could be suffering from ammonia poisoning. Umfortunately, there is just not enough info to make an informed decision as to what is wrong.
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