DIY Co2 Recipe


DIY Co2 is an incredibly cost efficient way to start experimenting with CO2 for your aquarium. You can get started with CO2 for under $20 quite easily compared with $200 for a typical entry level commercial Co2 system. The most critical part of your DIY Co2 system is your recipe, it determines how long your Co2 will last as well as how much Co2 will be delivered to the tank per second.

The active ingredients that produce the Co2 are Yeast and Sugar, the yeast consumes the sugar and creates alcohol while releasing Co2 as a biproduct. Eventually, the alcohol produced will poison and kill the yeast ending the Co2 production at which point you need to empty your bottle and start again. By having more sugar/yeast the Co2 production is much more intense but won’t last very long, on the other hand less yeast/sugar will result in a lower Co2 production but the mix won’t need to be replaced as often.

The recipe I settled on gives me a consistent medium Co2 release for around 2 weeks after which production starts slowing until it stops completely after 3 weeks. This might work for you but feel free to adjust as needed to find a balance that works for you.

The Ingredients

  • 2 cups sugar
  • 1/2 tsp yeast (regular dry baker’s yeast is fine)
  • Water



  1. Mix some lukewarm water (not too hot) and a teaspoon of sugar in a small cup or bowl
  2. Add the yeast and mix with a fork vigorously until the water is bubbly. Let it sit for at least 10 minutes stiring every few minutes to keep the water oxygenated.
  3. Fill your primary container with lukewarm water to roughly 2/3rds full.
  4. Using a funnel, add the 2 cups of sugar to the primary container and then shake to mix and dissolve the sugar in the water.
  5. Add the yeast and water mixture you prepared to the primary container. Co2 should start producing within a few hours.
Posted in DIY

DIY Python Water Change Tool

Python 50ft No spill Water Changer

The Python is a well known and popular tool for water changes. It’s simple and allows you to use the same hose for both draining and filling the aquarium. Today we want to look at a DIY solution to achieve the same results at a lower price.


Parts Required:


      1. Use the shut off valve and the Hose/Tube fitting to connect your gravel cleaner to your garden hose.
      2. Attach the other end of the garden hose to the waterbed fill & drain kit
      3. When ready for use attach the waterbed fill and drain kit to your tap faucet.



First ensure that the shut off valve is in the off position and the fill & drain kit is set to drain. Then insert the gravel cleaner into your aquarium and slowly adjust the shut off valve to start and control the flow of water. You should set the flow speed such that dirt is being sucked up off the bottom of the tank while your substrate remains grounded. Once the desired amount of water has been removed from the tank close the shut off valve. You can lift the gravel cleaner up in the air and open the shut off valve to clear the rest of the water in the hose.


To fill, start with the shut off valve off and the fill & drain kit set to drain. First run the water and get the temperature close to your aquarium water (a spare thermometer helps here). Once ready turn the valve on the fill & drain kit so that it runs through the hose. At your aquarium you can use the shut off valve to start running the fresh water into the tank. While it is filling you should add whatever tap water conditioner and other additives you normally use. Once filled simply close the shut off valve, take the gravel cleaner to the sink and open the shut off valve to empty the last of the water out of the hose.

Posted in DIY