maracyn
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Great1.2%return rate — above 6% kills the launch gate
Conversion
Great9.6%search→purchase rate — share of searches ending in a sale
Avg price
Great$19.46avg listing price — sweet spot $15–$100
Price range
Good$4.53–$36.89cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good$319K$319K/yr · 170K searches
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Bad5,240.33avg incumbent reviews — the moat a new listing must climb
Growth
Bad-16.9%90-day search growth — must beat 0% to launch
Competition
Bad89%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, maracyn is a $319K/yr Amazon United States market (170K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Mar–Apr–Jul. Verdict: Skip it — 43/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
maracyn market data
- Units sold / yr
- 13K–15K
- avg 1,250–1,500/product
- Revenue / yr
- $243K–$292K
- units × avg price
- Launch success
- —
- 0 of 1 new (360d)
- Conversion rate
- 9.6%
- Avg BSR
- #128
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 67%
- Out of stock
- 0.0%
- Avg brand age
- 61 months
- Avg seller age
- 170 days
Competition & brand share
The top 5 products capture 89% of clicks — a locked-up shelf that new listings rarely crack.Brands
4 flat
Sellers
47
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
89%
Top 20: 100%
Open market
0%
- API53%
- Fritz Aquatics36%
- Seachem8%
- Magrank2%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -16.9% search growth over the last 90 days.Peak months: Mar, Apr, Jul · busiest ÷ quietest = 3.2×
Top maracyn search terms
- maracyn25K/yr
- maracyn 222K/yr
- api fin and body cure15K/yr
- erythromycin for fish19K/yr
- fritz maracyn12K/yr
- api em erythromycin11K/yr
- doxycycline for fish9K/yr
- furan 27K/yr
- tetracycline for fish6K/yr
- maracyn two4K/yr
Top maracyn 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 9 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
API FIN & BODY CURE Freshwater Fish Powder Medication 10-Count Box
API$16.114.4★3,763 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
Kanaplex 5 g(0.18 oz)
Seachem$10.744.6★3,935 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$25.604.5★478 rev
API MELAFIX Freshwater Fish Bacterial Infection Remedy 16-Ounce Bottle
API$14.154.5★15,244 rev
Newest
by launch date
Magrank Women Checkered Jeans High Waisted Denim Capri Pants Race Day Black White Gingham Stretchy Baggy Jean S
Magrank$36.8970 rev
Fritz Maracyn - for Saltwater and Freshwater gram-Positive Relief from Bacterial gil Popeye More - Easy dose Packets 20 Count
Fritz Aquatics$36.23304 rev
Fritz Aquatics ParaCleanse Provides Fast Relief from Parasitic Diseases (20-Count)
Fritz Aquatics$22.41376 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
API FIN & BODY CURE Freshwater Fish Powder Medication 10-Count Box
API$16.113,763 rev
Trending
90-day click momentumMagrank Women Checkered Jeans High Waisted Denim Capri Pants Race Day Black White Gingham Stretchy Baggy Jean S
Magrank$36.894.0★
API FIN & BODY CURE Freshwater Fish Powder Medication 10-Count Box
API$16.114.4★
Kanaplex 5 g(0.18 oz)
Seachem$10.744.6★
API MELAFIX Freshwater Fish Bacterial Infection Remedy 4-Ounce Bottle
API$8.474.5★
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 maracyn
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”
“Worked as advertised”
“Strong”
“Clean sweep of flukes”
“The instructions are very clear”
“His color is much better”
“they fit perfect”
“good to have on hand”
What buyers complain about
“it nearly killed everything in under an hour”
“Which cost me a lot of money”
“It was enormous”
“Unfortunately, it did not work in my case”
“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”
“the scent also too strong”
“Removed charcoal filter”
“the product inside had leaked out some due to a loose cap and no seal”
Top return reasons
Common questions
- Is maracyn profitable to sell on Amazon United States?
- The niche generates $319K/yr across 9 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -16.9%. Flapen's verdict: Skip it (43/100).
- How competitive is the maracyn niche?
- 4 brands and 47 sellers compete. The top 5 products take 89% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in maracyn?
- Top complaints mined from reviews: Durability, Value For Money, Size-Overall. The return rate is 1.2%.
- When does demand for maracyn peak?
- Demand peaks in Mar–Apr–Jul; the busiest month runs 3.2× the quietest.
- What does it cost to enter the maracyn niche?
- Listings span $4.53–$36.89; the average listing price is $19.46 (sweet spot $15–$100). The average incumbent carries 5,240 reviews — the moat a new listing must climb.