Yellowing

Bottom Leaves are Yellowing. Water temps got to upper 70’s maybe 80. My lights stayed on(but I wouldthink that yellow would start at the top) I don’t think the timer was set right. Water level was to high. Ex/tds shows 1700 which according to FoxFarm is right on. Air temp is70* water temps are dropping. Ph is 6.0.
I’ve added water pump and air pump. About 8 hours ago. Appears to be getting worse. What do you suggest

You have root rot my friend.
High temps and lack of oxygen will cause it every time.

MickFoster said:

You have root rot my friend.
High temps and lack of oxygen will cause it every time.

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Is it reversible?

Looking at it it seems they are 100% rotted.
Seeing you just started i'd say start all over again. Reversing this takes time and the plant will suffer more which leads to slow growth as well.
Not an expert on this system but by the looks of it i would start over.