---
title: "Phytoplankton — $35K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/phytoplankton"
last_updated: "2026-07-21T20:41:36.781Z"
locale: en
meta:
description: "Niche score 44/100 · $35K/yr market · 37K searches/yr · $24.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · $35K/yr market · 37K searches/yr · $24.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Phytoplankton — $35K/yr Amazon US Niche (2026) - Flapen"
---
# **phytoplankton**
**Skip it**
A small market ($35K/yr) — this niche doesn't clear our bar today.
Market size 9Growth 18Conversion 48Competition 39Returns 99Price range 83Avg price 95Brand share 27Review moat 86Quality gap 33
**Returns**
**Incredible****0.2%**
return rate — above 6% kills the launch gate
**Avg price**
**Incredible****$24.46**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****274.45**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Great****$9.90–$44.99**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Okay****3.8%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****62%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****89%**
top-5 brand share — brands hold most of the demand
**Growth**
**Bad****-13.9%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$35K**
$35K/yr · 37K searches
According to Flapen's Amazon United States niche tracking, phytoplankton is a $35K/yr Amazon United States market (37K searches/yr). The top 5 brands hold 89% of demand. Verdict: Skip it — 44/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **phytoplankton market data**
- **Units sold / yr**
- **2K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$49K–$61K**
- units × avg price
- **Launch success**
- **—**
- 0 of 1 new (360d)
- **Conversion rate**
- **3.8%**
- **Avg BSR**
- **#1,365**
- **Page quality**
- **0%**
- **Prime**
- **75%**
- **Sponsored**
- **80%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **84 months**
- **Avg seller age**
- **174 days**
## **Competition & brand share**
The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**11 **▲rising
**Sellers**
**31**
**Top-5 brand share**
**89%**
Top 20: 100%
**Top-5 click share**
**62%**
Top 20: 100%
**Open market**
**9%**
- Seachem37% - Brightwell Aquatics24% - AlgaeBarn19% - Holistic Bin6% - Aqua Algae3% - Oceans Alive3% - Open — no brand owns it (5 brands, 9%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -13.9% search growth over the last 90 days.
1K600Holiday '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/pet-supplies/phytoplankton/trend)
## **Top phytoplankton search terms**
- **phytoplankton**28K/yr-16.7%4.8% conv. - **phytoplankton for saltwater aquarium**5K/yr-5.6%10.1% conv. - **live phytoplankton**5K/yr-7.1%4.6% conv. [**All search terms **](https://flapen.com/research/us/pet-supplies/phytoplankton/search-terms)
## **Top phytoplankton 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%$3K20%$7K30%$10K40%$14K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 20 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Reef Phytoplankton 250 mL / 8.5 fl. oz.**Seachem**$12.05**4.5★1,036 rev](https://www.amazon.com/dp/B004YLJ822) [2**Brightwell Aquatics PhytoChrom - Concentrated Phytoplankton Suspension for Improved Health and Coloration of Corals and Invertebrates 250-ml**Brightwell Aquatics**$11.25**4.7★126 rev](https://www.amazon.com/dp/B001DKM0HW) [3**OceanMagik Live Phytoplankton Blend - Tetra x Nanno x Iso x Thal Phyto Food for Coral and Copepod (32oz)**AlgaeBarn**$25.00**4.4★345 rev](https://www.amazon.com/dp/B01DSJ4UY6) [4**Reef Phytoplankton 500 mL / 16.9 fl. oz.**Seachem**$19.38**4.6★560 rev](https://www.amazon.com/dp/B004YLJ6OW) [5**Brightwell Aquatics PhytGreen-M Marine Phytoplankton for Reef Aquariums Supports Corals Sponges Clams Tube Worms & Filter Feeders Amino Acids EPA 500 ml**Brightwell Aquatics**$22.61**4.5★107 rev](https://www.amazon.com/dp/B001DDD3JI)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Complete Green Water (Chlorella vulgaris) Culture and Expansion Kit: One 8 oz Working Container One 1 oz Backup Container Harvesting Tools and Tap Water Conditioner - Live phytoplankton**BugBoy4Ever**$39.94**1 rev2mo ago](https://www.amazon.com/dp/B0GYJ78CZV) [**Barrier Reef Labs Phyto GroFormula (75g) Phytoplankton Reef Food Marine Phytoplankton for Saltwater Aquarium**BARRIER REEF LABS innovation meets the reef**$15.59**16 rev1y ago](https://www.amazon.com/dp/B0DW4JPWQT) [**AKI Marine Phytoplankton Powder - Source of Raw Omega-3 EPA Micro Algae Nannochloropsis - Plant Based Proteins Vitamins for Overall Wellness - Complete Protein Source Vegan & GMO Free (2oz/57g)**AKI ORGANIC**$27.47**113 rev4y ago](https://www.amazon.com/dp/B09H3W18C6) [**Aqua Algae F2 Ferts (16oz) Concentrated Guillards F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health**Aqua Algae**$28.14**139 rev5y ago](https://www.amazon.com/dp/B08ZYMLQ8G) [**Marine Phytoplankton Omega 3 Supplement Plant-Based Algae Capsules for Energy Focus & Cellular Support Vegan Superfood for Brain Heart & Skin Health 1 000mg 60 Vegan Capsules**Natural Curves**$35.11**48 rev5y ago](https://www.amazon.com/dp/B08VRQTFJ2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Complete Green Water (Chlorella vulgaris) Culture and Expansion Kit: One 8 oz Working Container One 1 oz Backup Container Harvesting Tools and Tap Water Conditioner - Live phytoplankton**BugBoy4Ever**$39.94**5.0★**▲ 312%**](https://www.amazon.com/dp/B0GYJ78CZV) [**OceanMagik Live Phytoplankton Blend - Tetra x Nanno x Iso x Thal Phyto Food for Coral and Copepod 16oz**AlgaeBarn**$14.99**4.4★**▲ 260%**](https://www.amazon.com/dp/B00LF4DKGQ) [**Brightwell Aquatics PhytGreen-M Marine Phytoplankton for Reef Aquariums Supports Corals Sponges Clams Tube Worms & Filter Feeders Amino Acids EPA 500 ml**Brightwell Aquatics**$22.61**4.5★**▲ 109%**](https://www.amazon.com/dp/B001DDD3JI) [**Marine Phytoplankton Omega 3 Supplement Plant-Based Algae Capsules for Energy Focus & Cellular Support Vegan Superfood for Brain Heart & Skin Health 1 000mg 60 Vegan Capsules**Natural Curves**$35.11**4.6★**▲ 83%**](https://www.amazon.com/dp/B08VRQTFJ2) [**Barrier Reef Labs Phyto GroFormula (75g) Phytoplankton Reef Food Marine Phytoplankton for Saltwater Aquarium**BARRIER REEF LABS innovation meets the reef**$15.59**4.8★**▲ 50%**](https://www.amazon.com/dp/B0DW4JPWQT)
**~~View all trending →~~**
## **What buyers say about phytoplankton**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**20%
*“Less Expensive”*
**Quality-Overall**19%
*“Very good quality”*
**Advertised Vs Actual Product**10%
*“works better than expected”*
**Ease Of Use**8%
*“Works well much easier than making your own”*
**Color**7%
*“Color was right”*
**Nutritional Content**6%
*“It really is a super human food”*
**Taste-Overall**5%
*“Good Sea Monkey food”*
**Vegan/Organic**3%
*“All bioavailable”*
**Energy Level**2%
*“I notice the extra energy”*
**Muscle Pain Relief**2%
*“it has helped support her spine health”*
### **What buyers complain about **
**Value For Money**13%
*“Will be paying double for a usable product”*
**Color**10%
*“Phytoplankton is brown, not green”*
**Ease Of Use**10%
*“not always practical”*
**Leak-Proof**10%
*“leaked”*
**Smell**8%
*“I dont like marine/seaweed smell”*
**Taste-Overall**6%
*“These capsules have no taste at all”*
**Stale/Rotten/Spoiled**5%
*“Phytoplankton smells bad”*
**Contamination**5%
*“Not sterile so take some caution”*
### **Top return reasons **
**Leak-Proof**33%
**Functionality-Overall**33%
**Defective Material/Parts**33%
## **Common questions**
- **Is phytoplankton profitable to sell on Amazon United States?**
- The niche generates $35K/yr across 20 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -13.9%. Flapen's verdict: Skip it (44/100).
- **How competitive is the phytoplankton niche?**
- 11 brands and 31 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 89% of demand.
- **What do buyers complain about in phytoplankton?**
- Top complaints mined from reviews: Value For Money, Color, Ease Of Use. The return rate is 0.2%.
- **When does demand for phytoplankton peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the phytoplankton niche?**
- Listings span $9.90–$44.99; the average listing price is $24.46 (sweet spot $15–$100). The average incumbent carries 274 reviews — the moat a new listing must climb.
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