---
title: "Fish Antibiotic — $2.1M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/fish-antibiotic"
last_updated: "2026-07-21T19:34:49.622Z"
locale: en
meta:
description: "Niche score 55/100 · $2.1M/yr market · 576K searches/yr · $28.62 avg price. Soft demand (-12.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $2.1M/yr market · 576K searches/yr · $28.62 avg price. Soft demand (-12.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Fish Antibiotic — $2.1M/yr Amazon US Niche (2026) - Flapen"
---
# **fish antibiotic**
**Worth a look**
Shows searches that convert (12.9% search→purchase), but soft demand (-12.7% this quarter) keeps it on the watch list.
Market size 95Growth 19Conversion 96Competition 25Returns 90Price range 84Avg price 95Brand share 20Review moat 27Quality gap 28
**Conversion**
**Incredible****12.9%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Incredible****$2.1M**
$2.1M/yr · 576K searches
**Avg price**
**Incredible****$28.62**
avg listing price — sweet spot $15–$100
**Returns**
**Great****1.3%**
return rate — above 6% kills the launch gate
**Price range**
**Great****$4.53–$80.57**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****3,751.77**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****70%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Bad****92%**
top-5 brand share — brand-locked demand
**Growth**
**Bad****-12.7%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, fish antibiotic is a $2.1M/yr Amazon United States market (576K searches/yr). The top 5 brands hold 92% of demand. Verdict: Worth a look — 55/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fish antibiotic market data**
- **Units sold / yr**
- **60K–80K**
- avg 4,000–5,000/product
- **Revenue / yr**
- **$1.7M–$2.3M**
- units × avg price
- **Launch success**
- **—**
- 0 of 0 new (360d)
- **Conversion rate**
- **12.9%**
- **Avg BSR**
- **#87**
- **Page quality**
- **0%**
- **Prime**
- **92%**
- **Sponsored**
- **54%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **69 months**
- **Avg seller age**
- **161 days**
## **Competition & brand share**
The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**6 **▲rising
**Sellers**
**58**
**Top-5 brand share**
**92%**
Top 20: 94%
**Top-5 click share**
**70%**
Top 20: 100%
**Open market**
**2%**
- Seachem41% - API34% - Fritz Aquatics8% - --6% - Generic5% - Seachem Treatments3% - Open — no brand owns it (2%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -12.7% search growth over the last 90 days.
13K8KSpike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/pet-supplies/fish-antibiotic/trend)
## **Top fish antibiotic search terms**
- **kanaplex**115K/yr-14.8%14.9% conv. - **fish antibiotics**110K/yr-24.9%1.3% conv. - **seachem kanaplex**31K/yr+25.6%15.1% conv. - **kanaplex fish medication**42K/yr-14.9%15.8% conv. - **api general cure**33K/yr+25.7%2.3% conv. - **melafix**27K/yr-23.4%14.3% conv. - **fish medicine**22K/yr-14.9%3.4% conv. - **maracyn**25K/yr-11.1%9.0% conv. - **maracyn 2**22K/yr-10.8%4.7% conv. - **api fin and body cure**15K/yr-2.0%21.0% conv. [**All search terms **](https://flapen.com/research/us/pet-supplies/fish-antibiotic/search-terms)
## **Top fish antibiotic products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$213K20%$426K30%$639K40%$852K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Kanaplex 5 g(0.18 oz)**Seachem**$10.74**4.6★3,935 rev](https://www.amazon.com/dp/B00CJ0VY8G) [2**API FIN & BODY CURE Freshwater Fish Powder Medication 10-Count Box**API**$16.11**4.4★3,763 rev](https://www.amazon.com/dp/B06XDFJ5XN) [3**API MELAFIX Freshwater Fish Bacterial Infection Remedy 16-Ounce Bottle**API**$14.15**4.5★15,244 rev](https://www.amazon.com/dp/B0002567T6) [4**Fritz Maracyn - for Saltwater and Freshwater gram-Positive Relief from Bacterial gil Popeye More - Easy dose Packets 20 Count**Fritz Aquatics**$36.23**4.6★304 rev](https://www.amazon.com/dp/B0D31Z3TQM) [5**API MELAFIX Freshwater Fish Bacterial Infection Remedy 4-Ounce Bottle**API**$8.47**4.5★15,244 rev](https://www.amazon.com/dp/B0002567SM)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Fritz Maracyn - for Saltwater and Freshwater gram-Positive Relief from Bacterial gil Popeye More - Easy dose Packets 20 Count**Fritz Aquatics**$36.23**304 rev2y ago](https://www.amazon.com/dp/B0D31Z3TQM) [**SMetroplex METRONlDAZOLE Focus Kanaplex Paraguard Neoplex Sulfaplex Polyguard Garlic Guard Saltwater Freshwater Aquarium lnfection ANTlBlOTlC (3 Pack Kanaplex 5g Each)**--**$28.50**104 rev2y ago](https://www.amazon.com/dp/B0CPVBQJG3) [**Metroplex METRONlDAZOLE Focus Kanaplex Paraguard Neoplex Sulfaplex Polyguard Garlic Guard Saltwater Freshwater Aquarium lnfection ANTlBlOTlC (Metroplex + Kanaplex + Focus)**Generic**$29.52**66 rev2y ago](https://www.amazon.com/dp/B0CPVBBYS5) [**API 2 Pack of Fin and Body Cure Freshwater Fish Medication Powder for Treatment of Bacterial Diseases Treats Body Slime Eye Cloud Fin and Tail Rot and Gill Disease (10-Count) (2 items)**API**$25.60**478 rev7y ago](https://www.amazon.com/dp/B07JJ18VZR) [**Ultimate Aquarium Treatment Bundle Pack - Metroplex Kanaplex Focus Garlic Guard - All in One Aquarium Treatment**Seachem Treatments**$33.78**837 rev8y ago](https://www.amazon.com/dp/B07CN3KT89)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**API General Cure Powder Packets 10 Count 6 Pack**API**$72.26**4.7★**▲ 247%**](https://www.amazon.com/dp/B073PCX96L) [**Metroplex METRONlDAZOLE Focus Kanaplex Paraguard Neoplex Sulfaplex Polyguard Garlic Guard Saltwater Freshwater Aquarium lnfection ANTlBlOTlC (Metroplex + Kanaplex + Focus)**Generic**$29.52**4.8★**▲ 36%**](https://www.amazon.com/dp/B0CPVBBYS5) [**Kanaplex 5 g(0.18 oz)**Seachem**$10.74**4.6★**▲ 16%**](https://www.amazon.com/dp/B00CJ0VY8G) [**API FIN & BODY CURE Freshwater Fish Powder Medication 10-Count Box**API**$16.11**4.4★**▲ 10%**](https://www.amazon.com/dp/B06XDFJ5XN) [**API 2 Pack of Fin and Body Cure Freshwater Fish Medication Powder for Treatment of Bacterial Diseases Treats Body Slime Eye Cloud Fin and Tail Rot and Gill Disease (10-Count) (2 items)**API**$25.60**4.5★**— 10%**](https://www.amazon.com/dp/B07JJ18VZR)
**~~View all trending →~~**
## **What buyers say about fish antibiotic**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**26%
*“Great product, Great results ⭐️ Definitely a great product, that WORKS”*
**Value For Money**19%
*“Price is affordable”*
**Ease Of Use**13%
*“Easy to use”*
**Instructions/User Manual/Troubleshooting**7%
*“The instructions are very clear”*
**Advertised Vs Actual Product**6%
*“Does the job”*
**Strength**5%
*“Strong”*
**Ease Of Cleaning**4%
*“clean from spots”*
**Ingredients-Overall**3%
*“The best antibiotic on the market for such a good price”*
**Comfort-Overall**2%
*“good to have on hand”*
**Hair Growth**1%
*“Improved my Bettas Fin Curling”*
### **What buyers complain about **
**Durability**14%
*“it nearly killed everything in under an hour”*
**Value For Money**12%
*“Which cost me a lot of money”*
**Size-Overall**11%
*“the scoop is tiny”*
**Functionality-Overall**9%
*“Unfortunately, it did not work in my case”*
**Leak-Proof**8%
*“the product inside had leaked out some due to a loose cap and no seal”*
**Allergies**4%
*“Our goldfish got an ammonia rash”*
**Ease Of Use**4%
*“Never easy to use”*
**Breathability**4%
*“from not being able to breath”*
**Color**3%
*“Red streaks were visible in the fins, faint color and overall miserable”*
**Water Flow**3%
*“Dont use in a 3 gallon tank”*
### **Top return reasons **
**Functionality-Overall**34%
**Advertised Vs Actual Product**16%
**Leak-Proof**12%
**Value For Money**11%
**Product Condition**5%
**Size-Overall**4%
**Durability**4%
**Defective Material/Parts**3%
**Ingredients-Overall**1%
**Contamination**1%
## **Common questions**
- **Is fish antibiotic profitable to sell on Amazon United States?**
- The niche generates $2.1M/yr across 13 tracked products. 90-day search growth is -12.7%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the fish antibiotic niche?**
- 6 brands and 58 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 92% of demand.
- **What do buyers complain about in fish antibiotic?**
- Top complaints mined from reviews: Durability, Value For Money, Size-Overall. The return rate is 1.3%.
- **When does demand for fish antibiotic peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the fish antibiotic niche?**
- Listings span $4.53–$80.57; the average listing price is $28.62 (sweet spot $15–$100). The average incumbent carries 3,752 reviews — the moat a new listing must climb.
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