Tangerine tigers you could say are like mountain lions... no matter how many mountain lions you breed together, you will only get mountain lions!
The colors of Neos on the other hand are more like labrador retrievers.... You could breed two labs of the same color together and get a variety of colors. Two black labs for example could throw black, brown and yellow offspring.
That's not an accurate representation by any means... just that, it might be a better way to look at it. Generally speaking, if you breed two shrimp together that are the same color, generally the offspring will be the same color! However, they were line bred/culled to achieve the "higher end" colors and if you don't keep up the culling, it's possible for the offspring to lose color over several generations.
I suck at breeding Neos... so I'm no help there!
However, if there's a specific color you want (i.e. blue or yellow), then see if there is an equivalent Tiger color you can choose instead. (not guaranteed apparently in some tiger colors to get that specific color in all offspring!)