Where do I get a diffuser today?

Attach the end of co2 tube to the intake of a power head,aim the nozzle toward the base of the plants.

Is one powerhead enough for a 125 gal? Is there a less conspicuous method, I hate to look at a powerhead? What is better reactor or powerhead?

discus33 said:

Is one powerhead enough for a 125 gal? Is there a less conspicuous method, I hate to look at a powerhead? What is better reactor or powerhead?

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For a 125 gal I highly recommend two sources of co2 in the aquarium(one in each corner),which means you will need a manifold ,two check valves ,2 needle valves ,2 bubble counters ,and 2 reactors.
But don't panic:icon_bigg ,for now use one reactor/power head ,and set your bubble counter to at least 5-6 bubbles per second,and have good circulation so the co2 goes all around the tank.
The parts I mentioned are available on Rex's site ,explain to him what you intend to do and he will set you up properly.
Power heads are good reactors but if you don't like the look of them in the tank,you could buy an external reactor or build one out of PVC or ask Rex to build you one.
Welcome to the slippery slope of fish keeping

get small powerheads. no need to get the large ones and blow everything in the tank apart. easier to hide too. use this for today till you can get a reactor or real diffusers. or whatever winds up being your final method.

It's just a pvc pipe on your line back to the tank. There's a diffuser that goes with it? Why not ask Rex?

Rex doesn't sell diffusers. He will, AFAIK, make reactors when requested, but he's primarily there to get you set up with the hardware to safely get CO2 out of your pressurized tank.

As for diffusers and reactors, there are 20 different ways to get the CO2 dispersed into your water column.

Take a look at some of the websites listed down in the sponsors portion of these forums on the main page. Many of them have reactors and diffusers that they sell on their websites.