How to Do a Water Change in Under 2 Minutes
- PNW Custom
- 4 days ago
- 3 min read
Water changes are one of the biggest reasons our desktop reef tanks stay healthy and successful long-term. With a simple routine, you can complete your weekly water change in less than two minutes. That's one of the reasons we love micro reefing. Maintenance is quick and easy to stay consistent with.
We'll also include a short video below that walks through the process step by step.
Why Weekly Water Changes Matter
We recommend performing a 30–50% water change once every week on desktop reef aquariums. Unlike larger reef tanks that often utilize dosing, regular water changes replace many of the elements your corals consume naturally.
Your weekly water change removes excess nutrients and waste and helps keep water crystal clear. A few minutes each week is much easier than fixing problems later.
What You'll Need
Before you begin, gather a few simple tools:
Fresh saltwater (temperature and salinity matched to your aquarium)
A Micro Bucket or another small container
Airline tubing or a turkey baster to remove water from the tank
Your bucket or container can be used for both collecting the old water and pouring the fresh saltwater back into the aquarium.
Step 1: Remove the Lid and Turn Off the Pump
Remove your aquarium lid and unplug or switch off the return pump. This prevents the pump from running while the water level is lowered and makes the water easier to siphon.
Step 2: Start the Siphon and Remove 30–50% of the Water
Using airline tubing or a turkey baster, remove approximately 30–50% of the aquarium water into your bucket or small container. Since desktop aquariums contain a small volume of water, this step is quick.
Step 3: Remove Any Visible Algae
While the water level is lower, use your algae scraper or cleaning tool to remove any visible algae from the walls and rockscape. The lowered water level makes it easier to reach every part of the aquarium.
Step 4: Remove the Siphon
Once you've removed enough water, take the siphon or turkey baster out of the aquarium.
Step 5: Discard the Old Water
Dispose of the old saltwater. Your bucket is now ready to hold the fresh saltwater for refilling the aquarium.
Step 6: Add Fresh Saltwater
Slowly pour the fresh saltwater over the overflow section of your aquarium. Pouring into the overflow helps reduce disturbance to your sand bed, prevents your aquascape and/or corals from shifting, and allows the water to gently flow back into the display.
Step 7: Wipe Down the Area
Use a towel to wipe away any water drips from the aquarium, stand, or countertop. Keeping the area clean helps prevent salt creep and keeps your setup looking its best.
Step 8: Turn the Pump Back On
Turnt the aquarium pump back on. Watch for a few seconds to make sure water is flowing normally through the filtration chamber.
Step 9: Replace the Lid
Put the lid back on the aquarium. Our fitted, polycarbonate lids help reduce evaporation and keep your aquarium stable between water changes.
Step 10: Enjoy!
That's it!
In less than two minutes you've:
Replaced important nutrients and trace elements
Removed waste from the aquarium
Helped keep your reef healthy
Simple, consistent maintenance is the key to long-term success with a desktop reef aquarium.
Make It a Weekly Habit
Your weekly water change is an essential tool for keeping your aquarium happy and healthy. There are also a few other important maintenance tasks that are quick and easy. Print out our free weekly checklist to stay on top of your maintenance and develop a consistent routine.
If you're looking for more beginner-friendly guides, checklists, videos, and reefing tips, be sure to visit the PNW Custom Resource Center. It's packed with free resources to help you build confidence and enjoy your reef from day one!
Do you have a set water change routine?
✅ Same day every week
🔄 Usually the same day
⏰ Whenever I have time
🤷 I need to get into a better routine
