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.

phytoplankton

Skip it

A small market ($35K/yr) — this niche doesn't clear our bar today.

Returns

Incredible0.2%

return rate — above 6% kills the launch gate

Avg price

Incredible$24.46

avg listing price — sweet spot $15–$100

Review moat

Great274.45

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

Okay3.8%

search→purchase rate — share of searches ending in a sale

Competition

Okay62%

top-5 click share — leaders hold, buyers still browse

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Okay89%

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

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

Top-5 brand share

89%

Top 20: 100%

Top-5 click share

62%

Top 20: 100%

Open market

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.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top phytoplankton search terms

phytoplankton28K/yr -16.7%4.8% conv.
phytoplankton for saltwater aquarium5K/yr -5.6%10.1% conv.
live phytoplankton5K/yr -7.1%4.6% conv.

All 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.

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

Reef Phytoplankton 250 mL / 8.5 fl. oz.

Seachem$12.054.5★1,036 rev

Brightwell Aquatics PhytoChrom - Concentrated Phytoplankton Suspension for Improved Health and Coloration of Corals and Invertebrates 250-ml

Brightwell Aquatics$11.254.7★126 rev

OceanMagik Live Phytoplankton Blend - Tetra x Nanno x Iso x Thal Phyto Food for Coral and Copepod (32oz)

AlgaeBarn$25.004.4★345 rev

Reef Phytoplankton 500 mL / 16.9 fl. oz.

Seachem$19.384.6★560 rev

Brightwell Aquatics PhytGreen-M Marine Phytoplankton for Reef Aquariums Supports Corals Sponges Clams Tube Worms & Filter Feeders Amino Acids EPA 500 ml

Brightwell Aquatics$22.614.5★107 rev

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$39.941 rev

2mo ago

Barrier Reef Labs Phyto GroFormula (75g) Phytoplankton Reef Food Marine Phytoplankton for Saltwater Aquarium

BARRIER REEF LABS innovation meets the reef$15.5916 rev

1y ago

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$27.47113 rev

4y ago

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$28.14139 rev

5y ago

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$35.1148 rev

5y ago

What buyers say about phytoplankton

What buyers praise and complain about, mined from review topics.

What buyers love

Value For Money20%

“Less Expensive”

Quality-Overall19%

“Very good quality”

Advertised Vs Actual Product10%

“works better than expected”

Ease Of Use8%

“Works well much easier than making your own”

Color7%

“Color was right”

Nutritional Content6%

“It really is a super human food”

Taste-Overall5%

“Good Sea Monkey food”

Vegan/Organic3%

“All bioavailable”

Energy Level2%

“I notice the extra energy”

Muscle Pain Relief2%

“it has helped support her spine health”

What buyers complain about

Value For Money13%

“Will be paying double for a usable product”

Color10%

“Phytoplankton is brown, not green”

Ease Of Use10%

“not always practical”

Leak-Proof10%

“leaked”

Smell8%

“I dont like marine/seaweed smell”

Taste-Overall6%

“These capsules have no taste at all”

Stale/Rotten/Spoiled5%

“Phytoplankton smells bad”

Contamination5%

“Not sterile so take some caution”

Top return reasons

Leak-Proof33%

Functionality-Overall33%

Defective Material/Parts33%

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.