In the present world where money is considered as a primary thing to do anything, it is a wonder people like you do this for free. I wish you all the Best. I am a graphic designer doing every thing for free.
You add a transform on the Editor window which you can get up by pressing F4. At the top of this window you have a triangle with a green plus icon; you press that to get a new transform. Hope this has helped you.
A simple answer would be have you tried to play around with the colours and brightness? Also are you using Apophysis 2.08? I haven't tried this tutorial out in 3D so if you are using Apophysis 3D, this can be the issue
It sounds like the image is grainy. If it is not this, I do apologize!! On Apophysis go on to Adjust (F5) and change the Gamma amount as well as the brightness. The image will still have a grainy look but then when you render the fractal, as long as the settings are high the fractal will look prefect. It can take a while to render a fractal at a high set but it is worth it
On the Transform Editor (F4), on the right hand side are the tabs like Triangle, Variations and Colors. On the Colors tab, you can change each triangle to any color you like, of course you have to chose first the set of colors on the Adjust screen then choose your Gradient.