Andrew

OK i have a Question... i have a ten gallon tank and a 2.5 gallon tank (that I'm going to be running CO2 to both tanks with one system).. should i make the mixture smaller or is it ok to put

1 cup of sugar
1 teaspoon of yeast
A pinch of baking soda

in a 1 litter bottle filled two about 2 inches from the top with water... or will it kill the fish? Because i've read some about this and most are in 20 gallon tanks.

hop2jr

Dwarf PM I would cut the mixer in half to start or use a 2litter bottle run that to a gas seperater than a check valve then T off to both tanks. If you wnted to you can get a inline regulater little plastic thing with a valve nob on it inline with the smaller tank so you could send more CO2 to the bigger tank I think they are for airlines. Just a thought.

cg49me

Just wanted to say, I put together a 4L system for my 29gal and a 2L system for my 10gal last weekend. The plants in both tanks have definitely shown increased growth, with the plants in the 10gal going absolutely crazy (the bottleneck in the 29gal now is light). I have anacharis in the 10gal that's grown more in the last week than it has the last couple of months.

Was going to mention that I was using a couple of those in-line regulators that hop2jr is talking about myself, and it turns out they aren't anywhere near airtight. At least mine weren't - the only reason they work for pumps is that the pump is putting out a ton of air compared to the DIY CO2 system.

Also, to Andrew, I don't think splitting one system to two tanks will work. The CO2 will probably all go to your 2.5gal, but none of it will get to the 10gal since there'll be more pressure on that side of the line.

LC Scotty

I've read here that folks have trouble maintaining a seal with the tops of the 2 L bottles. I decided to go threaded when making my first CO2 reactor.

The problem is that the smallest threaded fitting is too large for a typical 2 L pop bottle. However, a 2 q juice container (Welch's grape in this case) is much wider. So I went to Home-D and picked up an "Ander-Lign compression connector" for 1/4"od to 1/8" MIP. Basically, it has a threaded body-one side is 1/8" pipe threads and the other has threads that are part of the compression fitting. All you need is the body, you can chuck the ferrule and compression nut.

Then I went over to the lighting section. It turns out that the washers and nuts used in various lighting fixtures are pipe threads (yeah, I was surprised too) so I picked up a locknut and washer kit. Total cost at Home-D? About 3 bucks.

So, now I drill a hole in my cap, put one lock nut on the pipe thread side (pipe threads are tapered, for this connector it was the side of the body with a longer threaded section), seat that against the outside surface of the cap and then screw the other lock nut on the threads that protrude to the inside of the cap. Alittle bit of silicone to seal it up and away we go.

Basically, I think any 1/8 pipe nipple and two of these lock nuts will work. The end that the tubing will attach to will be too large for airling tubing, but a short piece of tygon and some barb adapters will get you down to the right size.

Andrew

Hey thanks for the info... I used a 1 liter bottle with another 1 liter bottle with water in it as a bubble counter and so if the other bottle over flows it doesn't go into my tank. And also i have decided not to run CO2 into both tanks..

Thank You.