wait until soil is dry before flushing out ,containers look a little small for root growth,make sure plants don't sit in drainoff water for long,if you can not get to a nute store, use Peters Professional Plant Food(available at Ace Hardware stores and elsewhere) use only 1/3 to 1/4 strength...it has micro nutes too...nute buildup and salts can do a plant like that....make sure it has good air flow and good supply of CO2...K.