I made my own CO2 set. It wasn’t the first time; I tried several times already but the result was always negative. I recently found out that I need use a specific kind of plastic tube (one that is pretty hard and thick) to make my CO2 set work. An other mistake was that I used water bottles,.. apparently the (plastic) bottles for water (and milk) is just too thin; you really have to use a coca cola, fanta, sprite bottle to make this work!
to make everything easier (because you will need to fill your CO2 bottle every week) I bought some bottle caps from ebay and a CO2 glass diffuser. Once you have everything, the set up is very easy and quick. There are dozens of bio-CO2 recipes online,.. they all differ a little bit. Some use a lot of sugar other prefer jelly and boiling water… the most important part is to have your whole et up leak free, onze you have that, you can easily switch to a better recipe etc. make sure you don’t use too much CO2 though. Im using quite much because there are still no fish in the tank, and Im having problems with algae. once the plants are thriving I will slowly lower the CO2 amount.
I made a little video of my CO2 set 🙂