Internal Filter

A compact fully-submersible filter for small tanks up to 30 gallons - simple, effective, no plumbing needed.

Price: Budget For: Freshwater $15-$80

📖 Overview

Internal power filters sit inside the tank, drawing water through a media chamber and returning it via a spray bar or spillover. Popular for small tanks and quarantine setups where an HOB is inconvenient.

🛒 Buying Guide

EHEIM Aquaball, Fluval U-series are popular choices.

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