Hey the plants are looking good. I see light is getting closer with growth, light can cause burnt top leaves and buds. If you want an all natural fattener/sweetener try 2 tablespoons of molasses in each gallon of water( its natural sugar and doesn't need to be flushed out) find at any grocery or market. Fat buds= good light+genetics+airflow+temperatures(70-83)+nutrients(flowering needs lots of P/K low N.

Hi there! You should stop using FishMix (or be very gentle with FishMix doses and stop it after the stretch) and start using blooming/flowering nutrients. Bio-Bloom is a good option if you want to go organic. You can also add some TopMax, the complementary flowering fertilizer from Biobizz, which activates cell production and increases flower development. I'll be around, good luck with these beauties!

The yellow leaves you see are due to a lack of nitrogen. Don't switch to flowering fertilizer yet. After switching to 12/12, the plants need a lot of growth fertilizer due to pre-flowering/stretch that lasts 3 weeks; after they stop stretching, switch to flowering. Try to raise the pH to around 6.5; 6 is fine, but you'll do better by raising it a bit. For flowering, I use Biobizz Bio-bloom and nothing else; I've tried several, and in the end, it's more important to have good temperatures and pH in range. Flowers don't fatten up overnight, so don't rush. Flowering takes 8 to 10 weeks, and you're just in the first one. The first 3 are pre-flowering where the plant grows a lot, then come 2 to 3 weeks where the flowers form little by little, very thin, and the rest is when they start to fatten and gain weight.