your feeding them too much nutrients or tooo little,

you have to mix the nutrients mix as said on the box with water and feed them once with it, the next time they need water give them water without the mix

like this


mon 1 tue 2 wed 3 thur 4 fri 5 sat 6 sun 7
water nowater nowater water nowater nowater water
with food no food nofood
just water just water


then, on monday the 8th day or on sunday the 7th day you water with the nutrients

*this all depends on how fast the water evaporates from the soil*