thanks for everyones votes and replies.
only bad thing about black is my tank was sw so it has stains on the glass.
a black backing shows off the stains.
and if i paint the tank i think it would be worse.
im trying to remove most of the stains but its tuff.
i guess im going to do my idea.
i have a white 9' vinyl pull down shade,plan to cut an 8x2 piece out of it.
then use black krylon paint that flexes and sticks to alot.
shouldnt look too bad.
and thats why im not painting the tank,down the road i can change it.
thanks again for the votes.