u fan leafs are dark green from getting too much N , healthy plants should really look like the new growth u are seeing. if leaves start looking dark green ad papery and the tips curling down then ur over feeding. its all a learning curve mate, i have been growing for years and theres been few grows where sumthing hasnt went wrong but weed has a great way of bouncing back and putting a smile on ur face. ur doing a great job keep it up.