Is this ok?

Can i use chrome ducktupe for wall relfection there white now and fyi my town doesn have emergency blankets (mylar) anywhere even walmart and on another note is it ok to use a bigger power supply (12v 5.8 amp) on a few 12 v 1.5 and lower amp cpu fans

white is a good reflector, done the thing with emergency blankets, i screwed mine up, then straightend them out to defuse the light, chrome tape causes hot spots

just leave it flat white.
save your money for higher wattage lights

Just order some mylar off of ebay bro. Pretty cheap and most effective. 100% illumination!!!

Or dollar store mylar wrapping paper, and yes, you can use a higher amperage transformer for the lower amperage fans.