I don't have any other thoughts to help at this moment other than the diamond goby is listed as a threat level 3 but didn't find a rating for the scooter but the ones listed are between 1 and 4. The higher the threat level usually means that they may be causing some seahorses to feel threatened.
My last resort when I can't figure out what is wrong is to place in hospital tank with heavy aeration and treat with Furan II and Diamox to cover most bases. If it works, I may not know the reason but don't care at that point if the seahorse survives.
Unfortunately, Diamox usually requires a prescription so I'd start with the Furan II while I source and obtain the Diamox.
I have had Diamox on hand for MANY years now, but it's been 2-3 years since I last used it as the longer I have been in the hobby, I finally learned just how diligent and extreme I need to be with tank water change frequency/volume coupled with extreme husbandry to remove uneaten food and detritus, especially searching out hidden spots around rock work and decor, AND from mechanical filtration, whatever type you use.
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Seahorses. Culture nanno, rotifers and brine shrimp.
Current Tank Info: Seahorses
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