I assume that will be going in the 66l tank in your signature.
It will do fine I use a similar sized diffuser on a 125l tank and at 5-6bps it keeps a constant 30ppm. I have the diffuser placed under my filer outlet so it blows the bubbles around the tank.
I use a pressurised system so im not sure if maintaining the required pressure for the gas to be forced through the plate will be easy in a DIY setup. Hopefully some one more experienced with DIY CO2 can help on this one.