As you have 4 erectus in a 38g tank you are placing a huge bioload on the tank and system, especially for 4 erectus which are a very large bodied seahorse.
Water quality seems to be a big thing with GBD and pouch emphysema so I'd figure you have to do larger, more frequent water changes coupled with vacuuming of detritus and uneaten food before it can decay.
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Seahorses. Culture nanno, rotifers and brine shrimp.
Current Tank Info: Seahorses
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