Hi no experience with the Rainbows and corys as I don't keep them, but the glowlight and lemon tetras based on my experience should get along just dandy.
I had kept them together with a total of 5 other types of tetras, they are just fine. Maybe occasionally there's a bully, but should not be a problem with your group size.
Lemon is kind of hard to find nowadays. I got mine from Tiong Bahru last time round, but I went there yesterday looking for more ruby tetras and I couldn't find neither.
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