Unfortunately I just lost one Seahorse to a similar problem (heavy breathing, then sudden spasms). I wish I found this topic about 8 hours earlier. I still have another seahorse left in this aquarium. It is a seahorse only aquarium (except the freindly feather duster). In looking at my other female seahorse, it does not show signs of heavy breathing and has been eating well. Do I have to worry about this one obtaining the same symptoms? Should I be safe and do the freshwater dip for cautionary purposes?
I’ve checked my water conditions and they are nearly perfect with the Nitrate, Nitrite, Ph, etc.. However I did have a spike in temp. that shot to 82 F. when I put a new lid on the aquarium. Could this have been the cause? I have since then removed the lid and temp has been reduced to 75. Also I replaced the air filter to a larger one for more flow. The original one seemed to have lost much of its power flow as of late last night.
I look forward to your knowledgeable input.