Leaves lighter on edges + some brown spots

That is 100% nutrient burn accompanied with over watering . The yellowing in the leaves indicated to me that your watering too much , and the browning at the end of the leaf tells me you're also feeding too much with nutrients . The only real way to correct this is to stop feeding with nutrients for a while till the yellowing slows and then comes to a stop . When you decide to use nutrients again , you should only mix them at 1/4 strength to start with when your plants are young and work you're way up from there . As for the the watering only water when your medium is dry up to your first knuckle this is a general rule of thumb , another good method to tell when its time to water is lift up your pot before you water and do it after you water you will be able to tell a big weight difference. This will help you determine when its time to give your ladies some water . You might also wanna consider a rooting agent and some humic/fulvic acid agents in order to help your plant on a speedy recovery . The rooting agent will promote new root growth as well as increase nutrient uptakes , and the humic/fulvic acid mixes are like a protein shake that will help rebuild your plants muscles faster . Products like this will help your plant get back on track quicker , grow faster as well as grow stronger . Over all your in good shape you just got a few simple things to correct and you will be rocking and rolling ! I hope this information helps you on your journey to becoming a Master !!! -Happy Growing!