What’s wrong with this plant ?

Hello @Danweedman ! That is a calcium deficiency and a little bit of phosphorous . First case for the calcium deficiency its because of your water . What is the EC of your water before you add the nutrients ? If its lower than 0.2 ms/cm then you need to consider start using the flora micro soft water and not the hard water or add some cal/mag until you get 0.4 ms/cm and then add the rest of the nutrients . Second case for your calcium and phosphorus deficiency is that the PH is a bit low . At this case first calibrate your ph meter and check if it was ok ( very common thing to have an off set PH meter... ). Then flush it with PH' d water and nutrients at your current EC value until you have a significant amount of run off ( 2-3 times the volume of your pot ) or you can measure the PH from the run off ( even though this technique isn't working properly to soils ) and stop the flushing according to the measurement. Third case for your calcium deficiency is that you are using a very strong phosphoric acid for PH down .If for some reason you don't start to steering immediately after you drop the PH down in to the tank then it reacts with calcium to form calcium phosphates ( caP ) . That is calcium and phosphorus that are no longer available. Try to diluting your PH down a little bit before you use it or start steering immediately after you drop it in to your mixing tank. Happy growing ! 👊