Water temperature was the ideal water temperature for vegging and blooming to flower

Go read this:
http://simplyhydro.com/nutrient_temp.htm


As you can tell, the author mentioned oxygen absorption @58 deg F.
I doubt if you will ever operate that low, but I have operated my grow @ less then 60deg F, and the growth was fantastic.
The caveat being the condensation pools that form under the plumbing aren't worth it (to me).
IMO run your soup at a temperature a couple of degrees just above the dew point and check for pooling.

 

You cannot have water at 23 deg F.
It is called ice at that temp. LOL
If you mean 23deg C, you are too warm.
Around 18 deg C is what I run (64 deg F).


http://www.texloc.com/closet/cl_cel_fah_chart.html

 

Try to get into the mid 60's.

 

I would recommend you not do nutrients until you have growth.


Having the light on does nothing if you don't have a plant growing.


Wait till something is sticking out of the top of the rockwool.

 

A week is usual maybe four days to poke something out.


Seeds usually split open in under a few days.

 

Don't give nutes for like two more weeks atleast. Those little circle leaves have all the nutes the plant needs for a while

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Yeah wait until the rounded leaves start to turn yellow, that means the plant has used all the nutrients they stored.

 

I keep my rez between 50 & 60 degrees Fahrenheit, Ive never had an issue.

 

The only "issue" I have running that low is the condensation pools that form under the plumbing.


I may thermal wrap the plumbing at some point and run lower.


I have seen great growth @ under 60 degF.