Fish Flex (Cephalexin / Keflex) for Aquarium Fish – 250mg & 500mg Capsules

Best Cephalexin-Based Antibiotics for Fish Infections | FixMox

The Fish Flex and Fish Flex Forte collection at FixMox.com delivers broad-spectrum antibiotic solutions to treat a wide range of bacterial infections in aquarium fish. Powered by Cephalexin (Keflex), these capsules are trusted for their safety and effectiveness in both freshwater and saltwater aquariums.

Why Choose Fish Flex & Flex Forte from FixMox?

• Broad-Spectrum Action: Targets both gram-positive and gram-negative bacteria, ideal for fin rot, gill infections, and skin ulcers.

• Effective Treatment: Cephalexin is known for treating common fish ailments quickly and efficiently.

• Easy to Use: Capsules can be added to food or dissolved in tank water for simple dosing.

• Safe & Reliable: When used as directed, Fish Flex products are safe for most ornamental fish species.

• Two Strengths Available:

  • 250mg for mild infections

  • 500mg for stronger or persistent conditions

Featured Products at FixMox

• Fish Flex – Cephalexin 250mg 100 Capsules
  Effective treatment for common fish bacterial infections.

• Fish Flex Forte – Cephalexin 500mg 100 Capsules
  Stronger formula ideal for more serious infections or larger fish.

Important Reminders

• Not for human use. Keep out of reach of children.

• Always consult a veterinarian or aquatic expert before use.

• Follow dosage and water change instructions exactly as indicated.

Explore More at FixMox

• Browse All Fish Antibiotics

• Visit the FixMox Homepage

Related Treatments

• Fish Amoxicillin – Broad-spectrum relief for a variety of bacterial infections

• Fish Penicillin – Classic gram-positive bacterial treatment

• Fish Sulfa (SMZ-TMP) – For more complex or resistant bacterial strains

• Water Conditioners – Supportive care during antibiotic treatment

Frequently Asked Questions

Q: What are Fish Flex and Fish Flex Forte?
A: They are Cephalexin-based antibiotics for aquarium fish, available in 250mg and 500mg strengths.

Q: What do they treat?
A: Common fish infections such as fin rot, popeye, tail rot, skin ulcers, and columnaris.

Q: How should I use them?
A: Capsules can be crushed and mixed with food or dissolved in water. Always follow package instructions.

Q: Are they reef-safe?
A: Cephalexin can affect invertebrates and beneficial bacteria. Avoid use in reef tanks unless under professional guidance.