led animated flow Chart

The project is aimed at animating a flow chart diagram used as a teaching aid by teachers to teach a concept. In this case Industrial manufacture of Sulphuric acid using WS2812 rgb leds. The leds are embeded on top of a canvas (see Attached Image) so that the learners' attention is held by the moving(reacting) leds which change colour as per the expcted effect. A lot of ground work has already been done and programing of the animation using arduino nano. What I need is better,clean and less bulky code using Fastled because that's what am more comfortable in unlike Adafruit (see the code attached) See the video attached for an idea of how the code should run. I want to improve it further by adding a voice over as the animation run, incase the leaner wants to use it in the absence of the teacher. I also have a LCD (1602) module which would display the chemical process at a particular stage ( chemical equation) The led connection has 10 stages packaged as 5 strips and 5 matrices. 1st stage is one strip containing 16 leds that have been curved as inverted letter C in a way half chases yellow and the other blue. on stages where there are matrices i want to animate good reaction process, where the leds represent the molecules or atoms. I stage two for example the two materials Sulphur(Yellow) react with oxygen(blue) to gradually change to green.