DIY C02?

Can anyone tell me how to make a DIY c02 difusser? I have tried once before and some of the yeast mixture went into my aquarium . My fish are ok from it so far .What did i do wrong? That was my first attempt and kinda scared to try it again. Any ideas?
thank you in advanced
Leah

I think most people use a two litre soda bottle with an air line glued into the cap. You can also buy inexpensive, professionally designed sugar and yeast fermentation systems from the on line aquarium shops. However, the fermentation systems work 24 hours a day, and plants give off carbon dioxide at night. All that CO2 can stress the fish, and the fermentation process produces gases in addition to CO2. The sophisticated and expensive systems that use pressurised CO2 bottles can be programmed to shut off at night.

If you want to grow exotic, fussy aquarium plants, CO2 supplementation and intense lighting will give good results. Carbon dioxide will also mess with water chemistry and,thus, the fish. You need to know more about aquarium chemistry than I do, and you need some good test equipment.

I love planted aquariums, but I take the easy way out and don't mess with plants that have special needs. Many of the common aquarium plants do just fine with regular aquarium lighting plus a substrate supplement like laterite. If you really want to raise some special plants, you might consider setting up an aquarium for just plants.

Gee, that was long winded. I hope some of it helped. Welcome to the forum.

Thank you!! I might just leave it for now and see how my plants do..if they do fine im not gonna bother with C02 mumble shmumble.... my fish seem to be doing fine..im going to test my water tommorow and see if everythings ok. Good thing about my LFS is that they can test my water free of charge ..no confusing tests
thanks for the quick response to my question.
Leah

Some local aquarium shops provide excellent help, and some offer to test aquarium water in order to sell you chemicals. Test kits are inexpensive, especially if you shop on line. Ammonia is probably the most important parameter to test, and that particular test kit is not always sold with things like dip testers. The quick dip kits can give approximate values for nitrite, nitrate, pH, hardness, etc. Nitrite is also important to watch; like ammonia, it can kill aquarium fish. Most but not all common aquarium fish species are pretty well adapted to a wide range of water parameters and do not require perfect water. However, sudden changes in water parameters can kill fish, so don't start dumping in chemicals unless you really know what effects they will have. Regular, partial water changes will provide a healthy aquarium environment and are usually more effective than chemical treatments.

that is a good idea. thanx john