nice pump and res you had.
how you maked it black?
I used 80% Automotive window tint. you can get this at your auto parts store. DO NOT USE anything but water to install it. The recommended solution they sell will affect your acrylic. it is a slow process because you must work out the air bubbles as you go.
If you are not familiar with the product it is a very thin piece. of tinted sheet that you lay over the window. it has self adhesive on the back that is invisible.