---
title: "Reviews — fish tank filter cartridge - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/fish-tank-filter-cartridge/reviews"
last_updated: "2026-07-21T21:03:41.150Z"
locale: en
meta:
  description: "Niche score 55/100 · $189K/yr market · 238K searches/yr · $12.92 avg price. Soft demand (-2.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 55/100 · $189K/yr market · 238K searches/yr · $12.92 avg price. Soft demand (-2.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Reviews — fish tank filter cartridge - Flapen"
---

# **fish tank filter cartridge**

**Worth a look**

Shows low returns (1.8%), but soft demand (-2.7% this quarter) keeps it on the watch list.

Market size 38Growth 24Conversion 68Competition 75Returns 80Price range 69Avg price 58Brand share 58Review moat 24Quality gap 62

**Returns**

**Great****1.8%**

return rate — above 6% kills the launch gate

**Competition**

**Great****40%**

top-5 click share — an open shelf

**Price range**

**Good****$6.37–$33.92**

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

**Conversion**

**Good****6.2%**

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

**Quality gap**

**Good****4.4★**

avg incumbent rating — lower means beatable quality

**Brand share**

**Good****70%**

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

**Avg price**

**Good****$12.92**

avg listing price — sweet spot $15–$100

**Market size**

**Okay****$189K**

$189K/yr · 238K searches

**Growth**

**Bad****-2.7%**

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

**Review moat**

**Bad****6,267.2**

avg incumbent reviews — the moat a new listing must climb