Help please

I'm using tropic bat mix .nutes bio bizz grow and bio bizz bloom I only fed them water for around 4 weeks because the soil was enough then I only used 1 ml per litre of grow and 1ml per litre of bloom only fed them 2 times with nutes then noticed the problem starting then just fed them water for the next 2 feeds and it was getting worse so the 3rd feed I used 0.5 ml of grow and 0.5 ml of bloom per litre and gave them 1and half litres each there in 20 litre pots .they are stardawg autos fro fastbuds .when I did feed them nutes the ph was 6.5 /6.6 .I didnt check run of or ppm .they was looking abit dark green at first