No help from an expert yet?

I'll do the best I can, but I'm in a much warmer zone than you are.

I would put it in the sun. Full sun.

Even if you have to bring it in every night, put it in the sun.

If you don't expect any more freezes, plant it in the ground.

I've never grown canna from seed, but I think they may revert to their species type.

No matter.

The species cannas have slender flowers, beloved by hummingbirds.

It's hard to tell what color a flower will be from the bud, but the reds I've seen have been mostly red, mahogany-ish, bronzy, or even blackish-red.

If the bud is salmon color, I would guess you'll get a bloom in that color family.

My cannas were leafing out nicely when we had a late freeze, which ruined every single leaf, & mine are coming back.

Yours, though, having been grownfrom seed, doesn't have the reserves of a rhizome to draw on, so it needs supplemental feeding for sure.

Best luck!

sylvia