Product Review
Best Fish Medications (2026)
Fish diseases need correct diagnosis before medication — many treatments harm filter bacteria, plants and shrimp. We compare General Cure, Paraguard and quarantine basics for planted tanks with CO2.
Quick comparison
All options in this guide
| Product | Med | Targets | Planted | Price ~ | Rating | Buy |
|---|---|---|---|---|---|---|
| Planted tank | General Cure | Parasites | Use with care | ~$10.98 | ||
| Planted tank | ParaGuard | External issues | Label dose | ~$55.95 | ||
| ~$10.98 |
#1 — Best overall
Editor's choiceAPI MELAFIX Bacterial Infection Remedy Liquid Super ICK Cure Medication | Treats Bacterial Infections, Damaged Fins, Ulcers, White Spots
· 1 reviews
API MELAFIX Freshwater Fish Bacterial Infection Remedy 16-Ounce Bottle API MELAFIX Freshwater Fish Bacterial Infection Remedy soothes the transition from store to home by reducing the risk of…
Pros
- Contains one (1) 16-oz bottle of API MELAFIX to treat bacterial infections and one (1) 4-oz bottle of API LIQUID SUPER ICK CURE to treat ich disease in…
- API MELAFIX heals bacterial infections, repairs damaged fins, ulcers and promotes tissue regrowth using natural tea tree extract.
- API LIQUID SUPER ICK CURE quickly kills the ich parasite typically within 24 hours, also provides a synthetic slime coat.
- Use API MELAFIX daily for a week to treat infections and for 3 days when adding new fish; use API LIQUID SUPER ICK CURE for 5 days when…
Cons
- Price varies by seller and region
- Check tank size and specs before buying
- May require extra accessories depending on setup
| Product | API MELAFIX Bacterial Infection Remedy Liquid Super ICK Cure Medication | Treats Bacterial Infections, Damaged Fins, Ulcers, White Spots |
| Brand | API |
| Use case | Planted tank / aquascape |
| Availability | Amazon / international |
| ASIN | B0BSKGHFY3 |
#2 — Parasites
Best valueSeachem ParaGuard, 2 Liter [Misc.]
· 1 reviews
![Seachem ParaGuard, 2 Liter [Misc.] - Aqua Plants Hub](https://aquaplantshub.s3.ap-southeast-1.amazonaws.com/wp-content/uploads/2026/06/seachem-paraguard-2-liter-misc.jpg)
Seachem ParaGuard is the only fish and filter safe aldehyde based (10% by weight) parasite control product available. ParaGuard contains no formaldehyde or methanol and will not alter…
Pros
- For freshwater & saltwater aquariums
- Fish & filter safe parasite control
- Seachem DOES NOT guarantee this product is safe for invertebrates and plants
- Use one capful for every 10 gallons. Repeat daily as required as long as fish show no stress. The entire 500 ml bottle will treat 1,000 gallons.
Cons
- Price varies by seller and region
- Check tank size and specs before buying
- May require extra accessories depending on setup
| Product | Seachem ParaGuard, 2 Liter [Misc.] |
| Brand | Seachem |
| Use case | Planted tank / aquascape |
| Availability | Amazon / international |
| ASIN | B00BUFYA32 |
#3
Large tankAPI Melafix Freshwater Fish Bacterial Infection Remedy 16-Ounce Bottle
· 1 reviews
API Melafix heals bacterial infections, repairs damaged fins and promotes regrowth of damaged tissue with natural tea tree extract.
Pros
- Treats bacterial infections and fin rot
- Natural tea tree extract formula
- Safe for freshwater aquariums when used as directed
- Promotes tissue regrowth on damaged fins
Cons
- Price varies by seller and region
- Check tank size and specs before buying
- May require extra accessories depending on setup
| Product | API Melafix Freshwater Fish Bacterial Infection Remedy 16-Ounce Bottle |
| Brand | API |
| Use case | Planted tank / aquascape |
| Availability | Amazon / international |
| ASIN | B0002DHRCQ |
Buying guide
How to choose the right product
Medication is a last resort — heat and quarantine often beat dosing display tanks for mild ich.
API General Cure
Praziquantel plus metronidazole for internal parasites and hexamita. Dose per label; usually quarantine-only due to filter impact. Not shrimp-safe.
Seachem Paraguard
Buffered formaldehyde/malachite green for ich, fungus and external lesions. Can treat display tanks at low dose; remove carbon during treatment.
Ich without meds
Raise temp to 28–30°C plus low salt if species tolerate — works for mild ich. Increase aeration at higher temperatures.
Planted & shrimp
Most fish meds are not shrimp-safe — hospital tank sick fish. Dose bacteria supplements after treatment; partial media swap if nitrite spikes.
Frequently asked questions
FAQ
Will General Cure treat ich?
It targets internal parasites primarily — external ich often needs Paraguard or heat/salt. Match medicine to symptoms.
Does Paraguard kill filter bacteria?
It can — monitor ammonia and nitrite during treatment. Add bacteria supplements and avoid replacing all bio media at once.
Can I medicate a shrimp tank?
Not recommended — move sick fish to quarantine. Shrimp are sensitive to formaldehyde and copper.
How long until meds clear the tank?
Varies by product — often 3–7 days plus carbon afterward. Retest water before reintroducing sensitive shrimp or plants.
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