---
title: "Fish Antibiotics — £79K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/pet-supplies/fish-antibiotics"
last_updated: "2026-07-31T08:46:32.730Z"
locale: en
meta:
description: "Niche score 36/100 · £79K/yr market · 89K searches/yr · £9.02 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 36/100 · £79K/yr market · 89K searches/yr · £9.02 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Fish Antibiotics — £79K/yr Amazon UK Niche (2026) - Flapen"
---
# **fish antibiotics**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 20Growth 8Conversion 87Competition 31Returns 98Price range 14Avg price 25Brand share 0Review moat 33Quality gap 53
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****9.9%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****3,236.38**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****66%**
top-5 click share — leaders hold, buyers still browse
**Avg price**
**Okay****£9.02**
avg listing price — sweet spot $15–$100
**Market size**
**Bad****£79K**
£79K/yr · 89K searches
**Price range**
**Bad****£3.78–£16.89**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Bad****-33.7%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United Kingdom niche tracking, fish antibiotics is a £79K/yr Amazon United Kingdom market (89K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Oct. Verdict: Skip it — 36/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fish antibiotics market data**
- **Units sold / yr**
- **6K–8K**
- avg 250–500/product
- **Revenue / yr**
- **£54K–£72K**
- units × avg price
- **Conversion rate**
- **9.9%**
- **Avg BSR**
- **#94**
- **Page quality**
- **0%**
- **Prime**
- **81%**
- **Sponsored**
- **63%**
- **Out of stock**
- **1.4%**
- **Avg brand age**
- **90 months**
- **Avg seller age**
- **179 days**
## **Competition & brand share**
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**5 **▼falling
**Sellers**
**38**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**66%**
Top 20: 100%
**Open market**
**0%**
- API76% - NT Labs11% - Ace Canine6% - Interpet5% - Tetra2%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -33.7% search growth over the last 90 days.
2K2KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Oct · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/uk/pet-supplies/fish-antibiotics/trend)
## **Top fish antibiotics search terms**
- **kanaplex**13K/yr-18.9%3.2% conv. - **melafix fish treatment**9K/yr-17.2%20.2% conv. - **fish antibiotics**9K/yr-52.3%4.2% conv. - **api general cure**6K/yr-21.2%1.5% conv. - **fin rot treatment tropical fish**7K/yr-33.3%15.1% conv. - **fish treatment**5K/yr-22.4%3.1% conv. - **melafix**7K/yr-31.4%18.8% conv. - **seachem kanaplex**3K/yr+1.4%1.9% conv. - **fish medicine**4K/yr-11.9%7.7% conv. - **api melafix**5K/yr-64.9%22.1% conv. [**All search terms **](https://flapen.com/research/uk/pet-supplies/fish-antibiotics/search-terms)
## **Top fish antibiotics 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%£8K20%£16K30%£24K40%£32K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**API Melafix Freshwater Fish Bacterial Infection Remedy 237ml Bottle**API**£7.94**4.5★11,330 rev](https://www.amazon.co.uk/dp/B0002567SW) [2**API Melafix Freshwater Fish Bacterial Infection Remedy 473 ml Bottle**API**£12.43**4.5★11,330 rev](https://www.amazon.co.uk/dp/B002XWMZIS) [3**API Melafix 118Ml**API**£5.87**4.5★924 rev](https://www.amazon.co.uk/dp/B0034DFBV8) [4**eSHa 2000 - Fungus Finrot and Bacteria Treatment *Pack Of Two***Ace Canine**£12.20**4.7★673 rev](https://www.amazon.co.uk/dp/B00C68JP2S) [5**NT Labs Aquarium Anti-Internal Bacteria Treatment (100ml Treats 500L)**NT Labs**£7.43**4.5★79 rev](https://www.amazon.co.uk/dp/B0084JI8ZS)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**API Fish Treatment Bundle Pimafix 237ml + Melafix 118ml Antifungal & Bacterial**API**£16.89**3 rev3mo ago](https://www.amazon.co.uk/dp/B0GX7BQ3YP) [**API Fish Treatment Remedy & Aquarium Salt Bundle Melafix 237ml + Salt 454g**API**£12.54**1 rev3mo ago](https://www.amazon.co.uk/dp/B0GX7B9H67) [**3 x 118ml API Fish First Aid Disease Treatment Bundle Fish Medication Bottle**API**£16.27**37 rev9mo ago](https://www.amazon.co.uk/dp/B0G3Q2WM5P) [**Interpet Anti Bacteria Aquarium Fish Treatment 100 ml clear**Interpet**£3.78**1,991 rev10y ago](https://www.amazon.co.uk/dp/B01FH2K2GM) [**Interpet Anti Fungus and Finrot Aquarium Fish Treatment 100 ml**Interpet**£3.99**2,420 rev10y ago](https://www.amazon.co.uk/dp/B01FH2K6LS)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**API Fish Treatment Remedy & Aquarium Salt Bundle Melafix 237ml + Salt 454g**API**£12.54**3.0★**▲ 314%**](https://www.amazon.co.uk/dp/B0GX7B9H67) [**API Fish Treatment Bundle Pimafix 237ml + Melafix 118ml Antifungal & Bacterial**API**£16.89**5.0★**▲ 300%**](https://www.amazon.co.uk/dp/B0GX7BQ3YP) [**Tetra Pond MediFin to Treat Most Common Fish Diseases 250 ml**Tetra**£6.79**4.6★**▲ 77%**](https://www.amazon.co.uk/dp/B002Q0NVDA) [**3 x 118ml API Fish First Aid Disease Treatment Bundle Fish Medication Bottle**API**£16.27**4.5★**▲ 45%**](https://www.amazon.co.uk/dp/B0G3Q2WM5P) [**NT Labs Aquarium Anti-Internal Bacteria Treatment (100ml Treats 500L)**NT Labs**£7.43**4.5★**▲ 43%**](https://www.amazon.co.uk/dp/B0084JI8ZS)
**~~View all trending →~~**
## **What buyers say about fish antibiotics**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Advertised Vs Actual Product**29%
*“As described, worked well”*
**Quality-Overall**26%
*“eSHa has very good products”*
**Water Flow**10%
*“Great for swim bladder”*
**Value For Money**10%
*“Fair price”*
**Ease Of Use**7%
*“Easy to use”*
**Color**3%
*“Totally recommend for any white stuff on them too”*
**Safety Standards**3%
*“Safe for scaleless fish”*
**Instructions/User Manual/Troubleshooting**1%
*“Instructions are clear”*
**Size-Overall**1%
*“Nice tiny bottle”*
**Brightness/Shine/Glow**1%
*“My fish is much brighter”*
### **What buyers complain about **
**Functionality-Overall**32%
*“Didn't work”*
**Time Taken**8%
*“it seems to take it time to work I thought I was going to loose my fish of 4 years at one stage”*
**Breathability**8%
*“He immediately became distressed and couldnt breathe”*
**Ingredients-Overall**8%
*“No mixing other product because killing the fish”*
**Contamination**8%
*“If anything it concerned me with the the additive spoiling my tanks bacterial environment”*
**Pet Friendly**8%
*“Not suitable for Bettas”*
**Durability**8%
*“wish I had listened my beautiful peppered corys are all dead 3 days after using”*
**Smell**4%
*“Clear and does not smell very nice”*
**Color**4%
*“Not methylene blue”*
**Advertised Vs Actual Product**4%
*“Used as per description, no results, like throwing freshwater in the tank”*
### **Top return reasons **
**Leak-Proof**31%
**Functionality-Overall**21%
**Compatibility-Overall**9%
**Durability**9%
**Advertised Vs Actual Product**7%
**Size-Overall**6%
**Certifications**6%
**Eco Friendliness**3%
**Defective Material/Parts**3%
**Product Condition**3%
## **Common questions**
- **Is fish antibiotics profitable to sell on Amazon United Kingdom?**
- The niche generates £79K/yr across 16 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is -33.7%. Flapen's verdict: Skip it (36/100).
- **How competitive is the fish antibiotics niche?**
- 5 brands and 38 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in fish antibiotics?**
- Top complaints mined from reviews: Functionality-Overall, Time Taken, Breathability. The return rate is 0.4%.
- **When does demand for fish antibiotics peak?**
- Demand peaks in Oct; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the fish antibiotics niche?**
- Listings span £3.78–£16.89; the average listing price is £9.02 (sweet spot $15–$100). The average incumbent carries 3,236 reviews — the moat a new listing must climb.
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