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. 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. 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. 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. 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. 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. 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