Fish Antibiotics for Aquarium & Ornamental Fish

Keep your aquarium fish healthy with CalVetSupply's trusted selection of fish antibiotics — available without a vet prescription and shipped fast across the U.S. Our collection includes Fish Mox (Amoxicillin), Fish Flex (Cephalexin), Fish Zithro (Azithromycin), and more, covering the full spectrum of bacterial infections that affect freshwater and saltwater ornamental fish.

Whether you're dealing with fin rot, dropsy, columnaris, ulcer disease, or bacterial gill disease, the right antibiotic makes the difference between a quick recovery and a worsening infection. Fish Mox is a go-to broad-spectrum option for dropsy and general infections, Fish Flex targets skin and soft tissue conditions, and Fish Zithro is highly effective against columnaris and external bacterial disease.

All products at CalVetSupply are intended for ornamental and aquarium fish use only. No vet visit required — just browse by condition or active ingredient, order with confidence, and get back to enjoying a thriving tank.