yellowing leaves i cant tell help please

hello fellow stoner can anyone tell me what defficency is this ,because i read alot of the forums on how to tell which deficency is which but i still cant pin point it. please help the two strain is wich the problem is in is blue cheese and chesiel it in its third week into flowerin im usein iguana juice bloom with nirvana as an additve flower booster,voodoo juice every three weeks and these baby drink water every 2 days 1 gal per pot and it only in two gallons pots.please help here are some pics2nd grow

No help come on people

phosphorus --------http://www.amsterdammarijuanaseedbank.com/Growguides/troubleshootingsolutions/marijuana-plant-abuse.html#root

I would try giving em a good flush, u can get lockout with organics too.