fish antibiotics
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.4%return rate — above 5% kills the launch gate
Conversion
Great9.9%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Review moat
Okay3,236.38avg incumbent reviews — the moat a new listing must climb
Competition
Okay66%top-5 click share — leaders hold, buyers still browse
Avg price
Okay£9.02avg listing price — sweet spot $15–$100
Market size
Bad£79K£79K/yr · 89K searches
Price range
Bad£3.78–£16.89cheapest 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
Bad100%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
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.Peak months: Oct · busiest ÷ quietest = 1.9×
Top fish antibiotics search terms
- kanaplex13K/yr
- melafix fish treatment9K/yr
- fish antibiotics9K/yr
- api general cure6K/yr
- fin rot treatment tropical fish7K/yr
- fish treatment5K/yr
- melafix7K/yr
- seachem kanaplex3K/yr
- fish medicine4K/yr
- api melafix5K/yr
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.
All 16 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
API Melafix Freshwater Fish Bacterial Infection Remedy 237ml Bottle
API£7.944.5★11,330 rev
API Melafix Freshwater Fish Bacterial Infection Remedy 473 ml Bottle
API£12.434.5★11,330 rev
API Melafix 118Ml
API£5.874.5★924 rev
eSHa 2000 - Fungus Finrot and Bacteria Treatment *Pack Of Two*
Ace Canine£12.204.7★673 rev
NT Labs Aquarium Anti-Internal Bacteria Treatment (100ml Treats 500L)
NT Labs£7.434.5★79 rev
Newest
by launch date
API Fish Treatment Bundle Pimafix 237ml + Melafix 118ml Antifungal & Bacterial
API£16.893 rev
API Fish Treatment Remedy & Aquarium Salt Bundle Melafix 237ml + Salt 454g
API£12.541 rev
3 x 118ml API Fish First Aid Disease Treatment Bundle Fish Medication Bottle
API£16.2737 rev
Interpet Anti Bacteria Aquarium Fish Treatment 100 ml clear
Interpet£3.781,991 rev
Interpet Anti Fungus and Finrot Aquarium Fish Treatment 100 ml
Interpet£3.992,420 rev
Trending
90-day click momentumAPI Fish Treatment Remedy & Aquarium Salt Bundle Melafix 237ml + Salt 454g
API£12.543.0★
API Fish Treatment Bundle Pimafix 237ml + Melafix 118ml Antifungal & Bacterial
API£16.895.0★
Tetra Pond MediFin to Treat Most Common Fish Diseases 250 ml
Tetra£6.794.6★
3 x 118ml API Fish First Aid Disease Treatment Bundle Fish Medication Bottle
API£16.274.5★
NT Labs Aquarium Anti-Internal Bacteria Treatment (100ml Treats 500L)
NT Labs£7.434.5★
What buyers say about fish antibiotics
What buyers praise and complain about, mined from review topics.What buyers love
“As described, worked well”
“eSHa has very good products”
“Great for swim bladder”
“Fair price”
“Easy to use”
“Totally recommend for any white stuff on them too”
“Safe for scaleless fish”
“Instructions are clear”
“Nice tiny bottle”
“My fish is much brighter”
What buyers complain about
“Didn't work”
“it seems to take it time to work I thought I was going to loose my fish of 4 years at one stage”
“He immediately became distressed and couldnt breathe”
“No mixing other product because killing the fish”
“If anything it concerned me with the the additive spoiling my tanks bacterial environment”
“Not suitable for Bettas”
“wish I had listened my beautiful peppered corys are all dead 3 days after using”
“Clear and does not smell very nice”
“Not methylene blue”
“Used as per description, no results, like throwing freshwater in the tank”
Top return reasons
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.