---
title: "Reviews — co2 dauertest aquarium - Flapen"
canonical_url: "https://flapen.com/research/de/auto-motorrad/co2-dauertest-aquarium/reviews"
last_updated: "2026-08-09T22:55:22.917Z"
locale: en
meta:
  description: "Niche score 51/100 · €207K/yr market · 56K searches/yr. A concentrated shelf (top 5 take 85% of clicks) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 51/100 · €207K/yr market · 56K searches/yr. A concentrated shelf (top 5 take 85% of clicks) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Reviews — co2 dauertest aquarium - Flapen"
---

# **co2 dauertest aquarium**

**Worth a look**

Shows beatable incumbent ratings (3.9★), but a concentrated shelf (top 5 take 85% of clicks) keeps it on the watch list.

Market size 40Growth 16Conversion 89Competition 13Returns 89Price range 61Avg price 95Brand share 26Review moat 62Quality gap 96

**Quality gap**

**Incredible****3.9★**

avg incumbent rating — lower means beatable quality

**Avg price**

**Incredible****€34.86**

avg listing price — sweet spot $15–$100

**Conversion**

**Great****10.6%**

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

**Returns**

**Great****1.3%**

return rate — above 5% kills the launch gate

**Review moat**

**Good****1,010**

avg incumbent reviews — the moat a new listing must climb

**Price range**

**Good****€11.16–€151.02**

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

**Market size**

**Okay****€207K**

€207K/yr · 56K searches

**Brand share**

**Okay****89%**

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

**Growth**

**Bad****-18.3%**

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

**Competition**

**Bad****85%**

top-5 click share — a locked-up shelf

**Signals**[** Quality Gap**](https://flapen.com/research/niches?market=de&signal=quality_gap "Avg rating < 4.0") [** Out of Stock**](https://flapen.com/research/niches?market=de&signal=out_of_stock "OOS rate > 10%")

## Reviews