Why pressure does not tell you how much CO₂ is left — and why the gauge only drops near the end.
Many people have the misconception that the pressure gauge on our CO₂ cylinder tells us the amount of CO₂ left in the cylinder. However, that is not true. The gauge measures pressure, not volume or weight. The pressure reading will usually only start dropping significantly when the cylinder is almost empty. This post will explain why.
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Last update: 20 April 2026
This is a list of places to top up CO2 for planted aquariums in Singapore. If you have any updates, please message me on my Instagram, ArowanaPlanted.
Bring your cylinder for an instant top-up.
Bring your cylinder and swap it for another. Low chance of getting your own cylinder back again.
Leave your cylinder and get it back filled a few days later.
Comes to your home to top up. Usually on the spot.
In this post, I will share about my Arowana tank covers which are safer, lightweight and do not block light and ventilation.
My criteria for tank covers are slightly more demanding than those for typical fish-only tanks as my tank is planted. Of course, the main reason for tank covers is to prevent our precious fish from jumping out. In addition, for planted tank purposes, I need to:
Manually removing algae is usually a tedious process and it is really difficult to get every last bit. Let me share with you an easy method that uses Hydrogen Peroxide (H2O2) to get the rest of the harder-to-remove algae.
Before you begin, remember that removing algae is not the same as solving your algae issues. To solve your recurring algae issues, you need to tackle the root causes and that is another matter altogether. This method helps you remove the existing algae while you try to tackle the root causes.
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There are a few ways to get CO2 for your aquarium. Some shops let you swap your empty cylinder for a filled cylinder, some refill your cylinder on the spot, and others help you send your cylinder to be refilled and let you collect it a few days later. Some hobbyists go to the gas suppliers directly for an on-the-spot or collect-later refill. Many of those who get their cylinder refilled wonder if they are getting back a full cylinder. This article will teach you how to tell.
Read More »Post Views: 74 Just an update on the tank and Arowana. After a long time, I think I’ve got a handle on the algae and plant growth issues. The plants are doing much better now and the annoying brown algae is retreating week by week. The only algae still persistent and hard to get rid […]
Post Views: 286 I’m very excited to share this with the Planted Tank community. For decades, we’ve been estimating our CO2 injection rates with bubble counters. Bubble counters are great at telling us whether our CO2 is flowing, but they are barely helpful when we need to adjust our CO2 flow rate. We usually start with […]
I’ve replied to this in Facebook groups a few times, so I decided to write this up to make it easier to share. Unfortunately, I am not planning on doing this soon, so there won’t be any videos or photos. But yes, I have done this before to remove a sand bank from my 600 litres (180 US gal ) planted tank.
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