I guesstimated by the pic....and if you are watering every 5 days thats too much water. Water just enough for about 2-3 days. That will help you to incorporate a feeding schedule in there when ready to feed...
plant small for a homer bucket you have large holes in bottom...gal of water to much for small plant in under filled large bucket roots look like they are staying wet
just my 2 cent
Did jacks nutes once ... i had the veg for 3 weeks they r one week in flower need to keep them small .seems like only bud sites are discolored and my second plant is looking fine..
The plant in the picture was topped also..