HELP!! yellow plants

Based on the leaf colouration, this is late-stage nitrogen deficiency. It's still early in flower, so try and incorporate nitro for the next 3 weeks. Don't overdo it, however. Also, make sure you keep your rootspace nice and aerated - to prevent any nutrient lockout via over/underwatering.

Wrong pH or too cold temps, will start calcium's issues soon. Never drown roots ! Let her dry out ! While she does so, but pH meter or strips. If you buy strips, search for better quality by rewies on Amazon and smaller distance, like 5.5-7.5 max, ussually they are for aquariums. She looks hungry, but till she don't start to uptake water fast - do not feed get anything else than light Cal mag, like 0.5 ml / l . Then she will be very hungry for PK and a bit still for nitrogen. All the Best !!!