Ok ive been looking into your Diary, i see leggy seedlings with droopy leaves. That mean 2 things for me... your Light is to wek// to far away.. and you are watering to much. Seedlings in this stage maybe need 20 ml every day. Its easier to water those little ones evry dy with a small amount, insted of drowing them once a week. Those small seedlings have no big roots atm they just have to develop,
remedies: Dig the seedlings deeper, get some soil around them
water them daily with asmall amount, start watering if soil is dry
give them airlow in setting uo afan , the seedlings should moce alittle in the airflow--- taht strengthen them
and..... NO FEEDING
For seedlings your Light may be ok... Iam using 2x26 watt light for my seedlings for the first 2 weeks, after tht, they go into " big Light"
So you can adjust everything, if you do like this
Happy growing