Harvest Vegetable Mix [COMPELTED - FAILED]

1 week mark:

How are your gardens growing?

Problems: Shortly after, though, I had a similar problem as before. The water was always warm to the touch. 
I put a thermometer in the water to track it, and it was ~25 C (77 F) during the nights and consistently climbing to 30 C (86 F) during the day. From what I know about temperature, this is generally too high for healthy plants, and causes both oxygen depletion and bacterial growth.

The symptom I noticed was that the leaves were a little yellowing, even though there was definitely enough fertilizer. I don't really know if this was a temperature problem or maybe a water problem.

Attempted solution: Since the temperature was so high, I tried what I read worked for some others, that is adding ice cubes to the water. One morning, I added 3 ice cubes to the water and it brought the temperature from 30 C down to 26 C.

Result: Unfortunately, the day after I added the ice cubes, the lettuce completely wilted. All the plants sort of stopped growing after that. I don't think I froze the roots, but maybe the sharp temperature change shocked the plants somehow?
Everything went downhill from here.

Attempted save: As a last-ditch effort, I transplanted the basil, kale, and two pepper plants outside.  Thankfully, after a week or so they recovered and are now growing happily. 
The lettuce was not salvageable, however.

One of the peppers is getting flower buds! Is it normal for peppers to be getting buds at this small size?

Yeah it does seem a bit young to be having flowers... maybe it was due to the stress of temperature changes or watering. 
I picked off the buds, thanks for the suggestion!

When my peppers are that small, carefully snip those buds off to force the plant to grow.  The buds will take power from the plant.  So I would snip them off.  Can you get a side shot so we can see the height?