How to Clean an Aquarium Like a Pro: Step-by-Step
By Ferplast U.K. | Published: 2026-10-17
Category: Tips & Care
Learn how to clean an aquarium like a pro with this step-by-step guide. From glass and gravel to filter maintenance, get practical tips for a healthy fish tank.
Quick answer
Start by unplugging all equipment, then clean the glass inside with an algae pad. Remove 10-20% of the water, vacuum the gravel, rinse filter media in tank water, and refill with dechlorinated water. Never clean everything at once to preserve beneficial bacteria.
Why a regular cleaning routine matters
A consistent cleaning schedule keeps algae under control, prevents waste buildup, and maintains stable water chemistry. Skipping cleanings can stress fish and lead to disease outbreaks. The goal is not a sterile tank but a balanced ecosystem.
Tools you will need
Gather an algae pad or scraper, a gravel vacuum, a bucket dedicated to aquarium use, dechlorinator, and a clean cloth for the outside glass. A glass thermometer like the BLU 6811 helps you monitor temperature during water changes. Avoid using soap or household cleaners anywhere near the tank.
Step-by-step aquarium cleaning routine
- 1. Unplug and prepare: Turn off the heater, filter, and lights. Remove any decorations that are easy to lift. This prevents damage and makes the water change safer. Checkpoint: Leave the filter media in place until later. Do not let it dry out.
- 2. Clean the glass inside: Use an algae pad or scraper to gently remove algae from the glass. Work from top to bottom so debris falls into the water for later removal. Common mistake: Scrubbing too hard can scratch acrylic tanks. Use a plastic pad for acrylic.
- 3. Vacuum the gravel: Insert the gravel vacuum and start a siphon into your bucket. Push the tube into the gravel to lift debris without removing too much substrate. Cover about one-third of the bottom per session. Checkpoint: Stop when you have removed 10-20% of the tank water. Do not empty the bucket into the sink—use it for plants.
- 4. Rinse filter media: Remove filter media (sponge, ceramic rings, etc.) and rinse them in the bucket of old tank water. Never use tap water, as chlorine kills beneficial bacteria. Common mistake: Replacing all media at once crashes the cycle. Rinse only one piece per cleaning.
- 5. Refill with dechlorinated water: Fill a clean bucket with fresh tap water and add dechlorinator according to the label. Match the temperature to the tank water (within 1-2°F) using the thermometer. Slowly pour the water back in. Checkpoint: Pour against a decoration or your hand to avoid disturbing the gravel.
- 6. Wipe the outside and restart: Use a microfiber cloth dampened with plain water to clean the outside glass and lid. Plug everything back in and check that the heater and filter are running normally. Common mistake: Using glass cleaner with ammonia can harm fish. Stick to water only.
Products that help with cleaning
- BLU 6811: BLU 6811 is a glass thermometer complete with fixing suction cup. Very thin and practical, you didn't notice it. Keeping water temperature stable during cleaning prevents shock to fish. This thermometer stays out of the way while giving a quick reading.
