Aquarium filtration: types and maintenance

What you’ll practice

From mechanical, biological, and chemical filtration to real-world maintenance routines, these questions focus on the decisions that keep an aquarium stable. You’ll also review how flow rate, stocking level, and tank size change what “good filtration” means.

Every question uses 4 options and there’s no timer, so you can think through scenarios like cloudy water, rising ammonia, or a noisy impeller without pressure.

Common pitfalls to avoid

Many issues come from over-cleaning or changing media too aggressively, which can crash beneficial bacteria and trigger ammonia spikes. Another frequent mistake is chasing “crystal clear” water with chemical media while ignoring mechanical clogging or inadequate bio capacity.

How difficulty and length are balanced

Difficulty is mixed: easier items cover terminology and filter types, while harder ones test troubleshooting, maintenance sequencing, and media placement logic. Before starting, choose your preferred question count and difficulty to match a quick refresher or a deeper skills check.

• Identify filter types (sponge, HOB, canister, sump) and where each fits best
• Choose and layer media correctly for mechanical, bio, and chemical roles
• Plan safe cleaning routines that protect nitrifying bacteria
• Diagnose low flow, microbubbles, leaks, and noisy pumps/impellers
• Match filtration capacity to bioload, feeding, and water-change habits
• Understand when to replace media vs rinse and reuse