fish antibiotic
Worth a lookShows searches that convert (12.9% search→purchase), but soft demand (-12.7% this quarter) keeps it on the watch list.
Conversion
Incredible12.9%search→purchase rate — share of searches ending in a sale
Market size
Incredible$2.1M$2.1M/yr · 576K searches
Avg price
Incredible$28.62avg listing price — sweet spot $15–$100
Returns
Great1.3%return rate — above 6% kills the launch gate
Price range
Great$4.53–$80.57cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Review moat
Okay3,751.77avg incumbent reviews — the moat a new listing must climb
Competition
Okay70%top-5 click share — leaders hold, buyers still browse
Brand share
Bad92%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
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.No pronounced peak months · busiest ÷ quietest = 1.4×
Top fish antibiotic search terms
- kanaplex115K/yr
- fish antibiotics110K/yr
- seachem kanaplex31K/yr
- kanaplex fish medication42K/yr
- api general cure33K/yr
- melafix27K/yr
- fish medicine22K/yr
- maracyn25K/yr
- maracyn 222K/yr
- api fin and body cure15K/yr
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.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Kanaplex 5 g(0.18 oz)
Seachem$10.744.6★3,935 rev
API FIN & BODY CURE Freshwater Fish Powder Medication 10-Count Box
API$16.114.4★3,763 rev
API MELAFIX Freshwater Fish Bacterial Infection Remedy 16-Ounce Bottle
API$14.154.5★15,244 rev
Fritz Maracyn - for Saltwater and Freshwater gram-Positive Relief from Bacterial gil Popeye More - Easy dose Packets 20 Count
Fritz Aquatics$36.234.6★304 rev
API MELAFIX Freshwater Fish Bacterial Infection Remedy 4-Ounce Bottle
API$8.474.5★15,244 rev
Newest
by launch dateFritz Maracyn - for Saltwater and Freshwater gram-Positive Relief from Bacterial gil Popeye More - Easy dose Packets 20 Count
Fritz Aquatics$36.23304 rev
SMetroplex METRONlDAZOLE Focus Kanaplex Paraguard Neoplex Sulfaplex Polyguard Garlic Guard Saltwater Freshwater Aquarium lnfection ANTlBlOTlC (3 Pack Kanaplex 5g Each)
--$28.50104 rev
Metroplex METRONlDAZOLE Focus Kanaplex Paraguard Neoplex Sulfaplex Polyguard Garlic Guard Saltwater Freshwater Aquarium lnfection ANTlBlOTlC (Metroplex + Kanaplex + Focus)
Generic$29.5266 rev
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$25.60478 rev
Ultimate Aquarium Treatment Bundle Pack - Metroplex Kanaplex Focus Garlic Guard - All in One Aquarium Treatment
Seachem Treatments$33.78837 rev
Trending
90-day click momentum
API General Cure Powder Packets 10 Count 6 Pack
API$72.264.7★
Metroplex METRONlDAZOLE Focus Kanaplex Paraguard Neoplex Sulfaplex Polyguard Garlic Guard Saltwater Freshwater Aquarium lnfection ANTlBlOTlC (Metroplex + Kanaplex + Focus)
Generic$29.524.8★
Kanaplex 5 g(0.18 oz)
Seachem$10.744.6★
API FIN & BODY CURE Freshwater Fish Powder Medication 10-Count Box
API$16.114.4★
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$25.604.5★
What buyers say about fish antibiotic
What buyers praise and complain about, mined from review topics.What buyers love
“Great product, Great results ⭐️ Definitely a great product, that WORKS”
“Price is affordable”
“Easy to use”
“The instructions are very clear”
“Does the job”
“Strong”
“clean from spots”
“The best antibiotic on the market for such a good price”
“good to have on hand”
“Improved my Bettas Fin Curling”
What buyers complain about
“it nearly killed everything in under an hour”
“Which cost me a lot of money”
“the scoop is tiny”
“Unfortunately, it did not work in my case”
“the product inside had leaked out some due to a loose cap and no seal”
“Our goldfish got an ammonia rash”
“Never easy to use”
“from not being able to breath”
“Red streaks were visible in the fins, faint color and overall miserable”
“Dont use in a 3 gallon tank”
Top return reasons
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.