---
title: "Reviews — 5 gallon fish tank filter - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/5-gallon-fish-tank-filter/reviews"
last_updated: "2026-07-21T20:10:57.307Z"
locale: en
meta:
  description: "Niche score 46/100 · $102K/yr market · 217K searches/yr · $10.88 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:description": "Niche score 46/100 · $102K/yr market · 217K searches/yr · $10.88 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:title": "Reviews — 5 gallon fish tank filter - Flapen"
---

# **5 gallon fish tank filter**

**Skip it**

Soft demand (-10.5% this quarter) — this niche doesn't clear our bar today.

Market size 25Growth 20Conversion 53Competition 56Returns 49Price range 45Avg price 41Brand share 58Review moat 38Quality gap 90

**Quality gap**

**Great****4.1★**

avg incumbent rating — lower means beatable quality

**Brand share**

**Good****70%**

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

**Competition**

**Good****52%**

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

**Conversion**

**Good****4.3%**

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

**Returns**

**Okay****3.2%**

return rate — above 6% kills the launch gate

**Price range**

**Okay****$5.91–$22.36**

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

**Avg price**

**Okay****$10.88**

avg listing price — sweet spot $15–$100

**Review moat**

**Okay****2,711.66**

avg incumbent reviews — the moat a new listing must climb

**Market size**

**Okay****$102K**

$102K/yr · 217K searches

**Growth**

**Bad****-10.5%**

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