What does this look like?

Hey guys, 1st grow here. Have 4, 48" t8 bulbs with half and half 2700k and 6500k. Been watering too much I think because of the leaf curling, so past few days have not been watering as much at all. Now the bottom leaf is looking pretty grim and the cotyledons are turning brown. Should I be worried? Anyone know what the problem could be?

Check the PH (kits are cheap) - New pots - IMO

PH should be good, I checked it a week ago with a kit I bought. Think the plants are big enough to transplant?

They look more then big enough to transplant.

I'd transplant as well, Ph can change rapidly in a small pot. I get em in their final pot as soon as i can

like these guys said, the plants are much too big for those cups.

Sworth is right !
Transplant them babys!
It could just be the container.

Note for future reference!
Larger containers require less maintenance!
As for smaller containers need more babysitting!

Jayy's

^Agreed, and it's likely the reason for the yellowing. You stated that you've been watering alot, so either you've washed nutes from the soil, starved the plants of oxygen(keeping them wet too long), or the soil is simply running low on nutes, naturally. It's possibly more than one of those mentioned, but at any rate...a transplant is the best solution, IMO, as long as you're sure your water doesn't have some wacked-out PH.lol The fresh soil will allow the plant to take in what it's lacking, and as long as you have established a good watering routine, you should be just fine, for a few more weeks.