yesterday i brought home some clones that were infested with aphids

I deffiantly slipped up by not checking them over better I just trusted the source they were comming from I didnt think they'd have bugs since that means this guy would have a way bigger problem, (spoiler, he does) anyways I got 4 clones to fill some empty pots that seedlings had died in, I planted them and added them into the room with about 20 other seedlings about a week old. today I went in to see how they're adjusting and under close inspection I could see the aphids very clearly on the stems and undersides of leafs, all stages of life from a couple winged adults to baby larva, I removed them from the room right away and checked the rest of the seedlings over, I dont see any on the seedlings right now but I cant help but feel like they spread and I cant see them, so I'm wondering what are the odds they did or didn't spread in the 24 or so hours they were in the room?

Captain jacks dead bug..

ALWAYS quarantine your clones.

Drench them with H2O2 (store bought=3%), including underside of leafs stems, and main stalk. maybe every 3 hours for 2 days, then make a light slurry of silica and spray them. You should be good to go, and as SPL said, quarantine