For a pouch evac, I used the plastic tip of a Joe's Juice injector, gently nudged that into the pouch & then massaged the pouch to get the air out. All of this has to be done with the seahorse still in the water, of course.
Good luck. Tetracycline should be available at pharmacies or the LFS or at least it used to be. It's one of the old time broadspectrum anti-biotics.
Anthony
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