I am making stupid mistakes with my planted tank, too, and I share them so that people like Zig and gf225 can tell me what I'm doing wrong. You are lucky they posted in your thread. Zig was just trying to be helpful. If I were you I'd take his advice. He knows what he is talking about, and I'm sure was not meaning to offend you. It is important to be able to take suggestions without getting offended, otherwise, nobody will be able to offer you any helpful advice. Thats probably why noone responded to your comment. If you're just expecting people to say "Good job!", even when you could have done better, theres not much point in posting a journal.
So see if there is some other way you can diffuse your CO2 like Zig said. Even though I don't have any experience with CO2 I can see problems with your design. Probably what Zig said was right and your algae problems are coming from not enough CO2. I would be willing to bet that it is because you have that thing buried in the sand. The point of having a diffuser is to maximize the amount of surface area between the CO2 and the water, so that more of it enters the water before it reaches the surface. Since its buried in the sand, only the rising bubbles are coming in contact with the water column, so you might as well just be diffusing it with an airstone, which, from what I hear, is not very effective. A blackout is a bit extreme in this case, and unless you have BGA, it probably shouldn't be the first thing you should do, judging by the many many topics I have read here documenting the experience of others.