Seachem KanaPlex 5g (0.18oz)
About this product
Seachem Kanaplex 5G (0.18Oz) — A potent antibacterial & antifungal powder for treating serious infections in fish and amphibians. 5g concentrated formula. Ships from Raleigh, NC.
Localreptileshows is a Raleigh, NC-based retailer specializing in reptile and amphibian care supplies. The Seachem KanaPlex 5g (0.18oz) is a broad-spectrum antibacterial and antifungal medication for treating infections in aquatic pets. Its targeted formula is effective against stubborn pathogens that other treatments miss. Available now for $14.29 with same-day shipping from our Raleigh warehouse.
Reviewed by Derrick Cole, Range Master & Reviewer at Localreptileshows. 19 years competitive shooting, product tester for 3 manufacturers.
Last updated: April 2026
In my years handling gear and supplies, I've learned that the right tool for the job is non-negotiable, whether it's a precision firearm or a reliable medication for a sick pet. Seachem KanaPlex is one of those tools I keep on my shelf. It's not a general-purpose remedy; it's a targeted, potent treatment designed for specific, serious infections. When you need to act fast and effectively, this is what you reach for.
What Are the Specifications?
Before you treat, you need to know exactly what you're using. Here are the hard facts on Seachem KanaPlex 5g.
| Specification | Detail |
|---|---|
| Product Type | Medicated Powder for Aquarium Use |
| Material | Kanamycin Sulfate (Active Ingredient) |
| Manufacturing | Pharmaceutical-grade production by Seachem Laboratories |
| Finish | Fine, off-white powder |
| Hardness/Quality | High-purity, laboratory-grade compound |
| Compatibility | Freshwater & Saltwater aquariums, with fish, invertebrates, amphibians (like axolotls) |
| Installation/Usage | Can be added directly to tank water, mixed with food, or used as a bath treatment |
| Weight | 5 grams (0.18 ounces) net weight |
| Dimensions (Container) | Approx. 2.5" H x 1.5" D |
| Country of Origin | United States |
| Condition | New, sealed container |
| SKU | SC-KP5G |
Key Features of Seachem KanaPlex
This isn't just another bottle of aquarium cure-all. Seachem KanaPlex has specific features that make it a go-to for serious hobbyists and breeders.
- Broad-Spectrum Antibacterial & Antifungal Action: The active ingredient, Kanamycin, is effective against a wide range of gram-negative and some gram-positive bacteria, as well as fungal infections. It targets the root cause, not just the symptoms.
- Flexible Application Methods: You can dose it directly into the water column for systemic treatment, mix it into a medicated food paste for internal infections, or use it as a focused bath. This flexibility lets you tailor the treatment to the specific illness.
Bio-Available Formula: Seachem formulates it to remain active in the water, ensuring the medication is absorbed by the fish or amphibian. Some medications break down too quickly; this one is designed to work.- Minimal Impact on Biological Filtration: When used as directed, KanaPlex is less likely to crash your established tank's beneficial bacteria cycle compared to some other antibiotics. This is a major advantage for maintaining tank stability during treatment.
- Concentrated Powder Form: The 5g powder is highly concentrated. A little goes a long way, making this small container effective for multiple treatments in standard-sized aquariums.
Who Should Buy Seachem KanaPlex?
Buy it if: You're an axolotl owner dealing with persistent fungal growths like columnaris or stubborn bacterial infections. You're a fish keeper facing fin rot, popeye, or septicemia that hasn't responded to milder treatments. You're a breeder or serious hobbyist who keeps a well-stocked medical kit for emergencies. You need a treatment that can be administered in food for pets that aren't eating.
Skip it if: You're looking for a general "tonic" or preventative medication for a healthy tank. You're dealing with a very common, mild case of ich (white spot disease)—there are more specific treatments for that. You need an immediate, over-the-counter solution for a parasite infection; this is for bacteria and fungus. For parasite treatments, see our Medications & Treatments category for alternatives like Praziquantel.
Pros and Cons
Based on handling this product and feedback from our community, here's the straightforward breakdown.
Pros:
- ✅ Highly effective against tough bacterial and fungal infections where other treatments fail.
- ✅ Multiple application methods (water, food, bath) provide treatment flexibility.
- ✅ Concentrated powder offers good value per dose.
- ✅ Generally safe for the biological filter when dosed correctly.
- ✅ Trusted, pharmaceutical-grade brand with a strong reputation in the aquatic hobby.
Cons:
- ❌ It is a treatment, not a cure-all. Correct diagnosis of the infection is crucial for success.
- ❌ As a powder, it requires careful measuring. An overdose can be harmful.
- ❌ It will not treat parasitic infections like ich or velvet. You need a different tool for that job.
How Does It Compare to Other Treatments?
Let's put it side-by-side with two common alternatives you might be considering.
| Feature | Seachem KanaPlex | Generic "Broad Spectrum" Liquid Cure (e.g., API Fin & Body Cure) | Premium/Hospital Tank System (e.g., Methylene Blue + Salt) |
|---|---|---|---|
| Material / Active Ingredient | Kanamycin Sulfate (targeted antibiotic) | Often a mix of nitrofurazone & other compounds | Methylene Blue (antiseptic/dye) & Sodium Chloride |
| Quality & Consistency | Pharmaceutical-grade, precise concentration | Can vary by batch; less regulated | Depends on component quality; more DIY |
| Compatibility | Fish, invertebrates, amphibians. Can be hard on some plants. | Often not safe for invertebrates or scaleless fish | Very harsh on plants & invertebrates; hospital tank only |
| Shipping & Storage | Dry powder, stable, easy to ship | Liquid, can freeze/leak, shorter shelf life | Multiple components to ship/store |
| Lifespan / Treatment Course | Concentrated; 5g treats many gallons over multiple doses | Liquid often requires larger volume per dose | Components have long shelf lives separately |
| Price Point | $14.29 (targeted, potent treatment) | ~$8-$12 (general, milder treatment) | ~$20+ for components + separate tank setup |
The takeaway? KanaPlex sits in the middle as a specific, potent tool. The generic liquid is a cheaper, broader but weaker option. The hospital tank method is effective but requires more equipment, knowledge, and is less convenient.
Frequently Asked Questions
Is Seachem KanaPlex safe for axolotls?
Yes, when used as directed, it is considered one of the safer and more effective treatments for common axolotl bacterial and fungal infections. Many axolotl specialists and breeders specifically recommend it. Always follow dosage instructions based on your water volume.
How do I dose Seachem KanaPlex?
The standard dose is 1 level measure (included in the cap) for every 20 gallons of water, every 48 hours for up to 3 doses. For mixing with food, use a very small "smear" mixed into a gelatin-based food. Always remove chemical filtration (like carbon) during treatment.
Can I use it in a tank with shrimp or snails?
Seachem states it is safe for invertebrates, including shrimp and snails. However, sensitivity can vary. Many hobbyists report no issues, but for valuable invertebrates, some prefer to treat the sick fish in a separate hospital tank as a precaution.
Will KanaPlex treat ich (white spot disease)?
No. Ich is a parasitic infection, and KanaPlex is an antibacterial/antifungal. Using it for ich will be ineffective and delay proper treatment. You need a parasite medication containing malachite green, formalin, or copper for ich.
Where can I buy Seachem KanaPlex 5g online?
You can purchase it right here from Localreptileshows (localreptileshows.com). We ship from Raleigh, NC, and typically have it in stock and ready to ship the same day if ordered before cutoff.
How should I store the powder?
Keep the container tightly sealed in a cool, dry place away from direct sunlight. Properly stored, it has a long shelf life. Avoid humidity, as it can cause the powder to clump.
What if my pet isn't getting better after treatment?
Stop treatment and reassess. The infection might be parasitic, viral, or caused by a bacteria resistant to Kanamycin. Water quality issues can also mimic disease symptoms. Consider consulting a veterinarian who specializes in aquatic animals for a definitive diagnosis.
✅ In stock — ready to ship today
✅ Same-day shipping from Raleigh, NC
✅ Discreet packaging
✅ 30-day returns
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When your aquatic pet is sick, you don't have time for guesswork or weak remedies. Seachem KanaPlex 5g provides a potent, professional-grade option for tackling serious infections head-on. It's a specific tool, but for the right job, it's incredibly effective.
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About this review: This assessment is based on hands-on evaluation of the product, manufacturer specifications, and aggregated feedback from the aquatic hobbyist community. As with any medication, results can vary based on accurate diagnosis, dosage, and individual animal health. Always follow label instructions.
Last updated: April 2026