Need help

Hey guys have 3 plants. Roughly about 5 weeks old. Using 400w hps 16 hours on 8 off. Using soil. Bottom feeding. Ok so I'm curious what this is on my leaves? It has yellowing it wasn't there early. Also the two bottom leaves have turned yellow. Just only gave it nutrients about 2 3 days ago. It's first feed. However I left my wife in charge to do this cause I was getting ready to have a shower. I come back and she said she feed all 3 half a bottle of nutrients to each plant is this the reason I'm facing yellowing. Is it overfeed what can I do?? I know I could flush them but want to try avoid doing this. This is a picture here. This is my main plant. Will post pictures of other 2 if needed thanks guys

If it is just those few leaves at the bottom then it could just be that the soil ran out of nutrients before you started feeding. How often are you watering? You aren't letting the pots sit in water, too, are you? The plant in the last picture also seems to be suffering from heat or the light is too close to it.

Yes sir. Just the Bottom ones but will update if the problem gets worse. Thank god I thought they wore over feed. Wife reckons she feed them half a littre of nutrients. And yeah that last one got burnt from the hps being to close. And they're only just now getting use to it. Coming from a bulb that wasn't even producing 60w for 3 plants haha big difference. Just turned there veg off. So they're napping. Back on in 8 hours. And nope I don't let them sit in stagnant water. If they haven't drunken what evers left by the next day I'm throwing it. Nine times out of ten though the water is gone when I return. Haven't had any still sitting there.