advice needed (pic)

traditional soil,
outdoor then move inside to avoid cold weather,
tap water, about a 1 cup a day at suset
water pH - unknown
Age of plant a 1 month in a half
Type of fertilizer well some white fine powder with small black dots idk what i put. heard it was for trees? i put it only once.

sunlight from 6 -4pm then 2 40 watt cfl from 4 -6pm

E-Air % Relative humidity idk
E-Lighting schedule 12-12
E-Type of ventilation your room has small oscialitin fan



my question is what to do about bottom leafs? the tops look good to me but the bottoms are lookin yellowish with brownish spots. thanks