What are you feeding them now?
I can't advise on the other contents but wild caught seahorses will need live foods for a long time until you can get them to gradually switch to eating frozen mysis.
The other thing is that the tank is not large enough really for that many seahorses let alone tankmates.
In lieu of a sufficiently large tank you will have to do MANY more and LARGER water changes than normal with special attention to removing any trapped uneaten food and other detritus before it provides food and bedding for nasty bacteria species like the vibrios.
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Seahorses. Culture nanno, rotifers and brine shrimp.
Current Tank Info: Seahorses
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