IDK about canopy (what's that?) but this is how I do lids:
If you wanna do it ghetto style like me (I think you should, if you asked me) then get
-- some clear greenhouse plastic film (UV resistant, usually 6 mil thick PE),
-- 2" spring clamps from Home depot for 99 cents to clamp the film to the tank, and
-- $5 aluminum shop lights 8.5" diameter, with Walmart LED daylight bulbs of chosen luminance, which can be placed onto the film or hung right above it.
You could do it for under $50.
$20 if your standards are some of the lowest and you are not afraid to Craigslist...
Yeah, almost forgot, hide all this splendor behind a curtain (there, that's your canopy), e.g., made from black, PP woven / compressed, ground water retention fabric, so nobody could copycat it.