---
title: "Trend — aquarium co2 system - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/aquarium-co2-system/trend"
last_updated: "2026-07-21T23:12:59.639Z"
locale: en
meta:
  description: "Niche score 54/100 · $300K/yr market · 284K searches/yr · $58.40 avg price. Soft demand (-17.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 54/100 · $300K/yr market · 284K searches/yr · $58.40 avg price. Soft demand (-17.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Trend — aquarium co2 system - Flapen"
---

# **aquarium co2 system**

**Worth a look**

Shows a sweet-spot price point ($58.40 avg), but soft demand (-17.7% this quarter) keeps it on the watch list.

Market size 51Growth 16Conversion 23Competition 71Returns 87Price range 57Avg price 90Brand share 35Review moat 70Quality gap 78

**Avg price**

**Great****$58.40**

avg listing price — sweet spot $15–$100

**Returns**

**Great****1.4%**

return rate — above 6% kills the launch gate

**Quality gap**

**Great****4.3★**

avg incumbent rating — lower means beatable quality

**Competition**

**Good****43%**

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

**Review moat**

**Good****707.09**

avg incumbent reviews — the moat a new listing must climb

**Price range**

**Good****$10.09–$158.05**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Market size**

**Good****$300K**

$300K/yr · 284K searches

**Brand share**

**Okay****84%**

top-5 brand share — brands hold most of the demand

**Conversion**

**Bad****1.8%**

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

**Growth**

**Bad****-17.7%**

90-day search growth — must beat 0% to launch