I have been using schedule 80 unions, fittings, and piping to minimize light, ie possibility of algae growth.
Am I spending the extra money foolishly? Are standard white schedule 40 pipe and fittings anything I should be concerned over?
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I’ve been using sch40 for over 10 years without giving it a second thought…
Algae and slime is most likely to come from a light leak in the reservoir lid or a netpot that’s not filled completely or pieces of leaves falling in the water.
You can always put pool noodles/pipe insulation tubes on your pipes for extra protection and that can help with water temps too 
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Paint it black to block light then paint it white to cut down on heat. Yeah , I said screw that too.
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