3 Gallon DWC Tangelo Rapido AF problems

Hey guys help would be much appreciated.

I recently ordered some Tangelo Rapido auto flowering seeds from barneys farm,
I have 3 going at approximately 23 days under a 400 watt hps im running a 3 gallon basic dwc hydro set up (First time doing hydro) and im using sensi bloom part a & b and liquid carboload.

So 2 days ago i cleaned my reservoir every thing looked good roots were white
leaves were happy and green. i fed them a 4 ml part a & b dose and 2 ml of liquid carbo load(Only second time nuting btw) (First time for the liquid carbo load) i checked the ph and it all looked good.

Yesterday i notice that the roots are starting to turn a orangish brown type of color (I was told this is root rot developing) So i immediately cleaned my reservoir and replaced the nutes like i did before then checked ph and everything looked good.
The plants were a little bit droopy but i assumed this could have been from stress due to me having to clean the reservoir twice in 2 days but even today it seems like they havnt recovered to much if anyone could give me an idea what i can do to save my plants im assuming they have root rot but im not getting a nasty smell or slimy roots just discolored roots.

I have attached pictures of my grow

all help is much appreciated thanks.

Have you tried Hydrogen peroxide in the res?

I added about 3 cap fulls (Wasnt sure how much to use) of 3% peroxide yesterday and today the roots are looking like theyre turning white again but the leaves are still drooping and some are turning yellow

The HPS lighting makes it hard to see the real colors of things. Try taking some pics under normal lighting. Also the yellowing leaves are from a lack of Nitrogen most likely. Bloom nutes are not needed for cannabis. Basic veg nute, 3-1-2 ratio or there abouts is all you need from start to finish. And the carboload is a waste of money. Plants make there own carbs, they do not uptake them through the roots.

Also get your air pump out of the lights. All you are doing is pumping warm air through the res raising the temps. Place the pump in as cool a place as possible.

Hello thanks for your response
I moved the pump out from under the light. That was probably really dumb of me to put it there in the first place but im still new at hydro.
I guess i wont be using the carbo load then. Good thing i only payed 8 dollars for 250 ml.
You say it could be a nitrogen deficiency and i need veg nutes? I have Fox Farms grow big liquid veg nutes that i use for soil grows do you know if this is safe for hydroponics use and mixing with Adanced Nutrients Sensi Bloom a & b?