Oh Fish! You're KILLIN' ME!!
Just kidding, Bro.....
You have to use a third party...flickr, shutterfly, photobucket, that type of thing. I like photobucket the best, but anything will do. Once you upload your pics to that site, it will give you an address which usually looks like "[IMG/www.photobucket.com/..........IMG]"; on photobucket there are four options for these image links, and it is the "bottom" selection that I use.....I don't think the top three selections work for posting pics here. It takes a little finagling, but if I can get it to work, so should you. After selecting the "right" image link to use, you just highlight it, and copy and paste it here in a new post (or you can Edit an old post and add the picture too). You can use any size (pixel by pixel), but I would use the default selection of 800x600 for starters. You can go "bigger," but then people here start screaming that it "takes too long to load your pictures," and so on.
A needle wheel pump is NOT a powerhead, though some powerheads do have needle wheels in them. What I talking about is a pump with a needle wheel mechanism inside the actual pump that "chops up" the CO2 gas into extremely fine bubbles, and is usually attached to a spray bar in the fish tank that pumps out water/fine bubbles of CO2 intermixed. :lol: This is the needle wheel itself:
This is the pump that it goes into:
In the last pic, you can see the tubing attached; this is where the CO2 would go into. Then, it is "sucked" into the needle wheel/pump housing and pump out again. It's missing the tubing that would bring in aquarium water into and out of the actual pump, so it may be a little difficult to visualize. The tubing that brings water into the pump would connect to the same side as the CO2 tubing; the tubing that pumps water out would be on the other side where you see the output opening (to left of the "G300" sticker).
In my opinion, it works better than diffusors or reactors....some might argue with me about it.
Anyhow, so now you know!