Please help my plants are sick

[Guerillagarden]

Hi my plants look really sick! 6 days ago they looked like the most Healthy plants I’ve ever had but I had to move them to bigger tent and now they look terrible the temps and humidity are basically exactly the same as the previous tent . They were under a xxl t5 and now they are under adjustawatt 720 led on 25%I’m growing in bio bizz soil with bio grow and alg a mic ph around 6.9-7.2 every feed I can’t work out what’s going wrong. They basically looked noticeably different over night and gradually over 5-6 days look awful any help or input would be greatly appreciated.

 

[Guerillagarden]

Here’s another pic 1 or 2 don’t look too bad but overall their quite sick don’t know how they could change so fast

 

[carlosescobar]

they look overwatered to me , i think overwaterin locks out nitrogen first so they will yellow, and a very bright light will lock out potassium , even more yellowing down the edge of the leaves. but you said your light is at 25% so it should be ok...drainage looks poor as well ,
also if that heater is heating the soil up to near 30 oC it will stress the plant