PLEASE!!!Help an aussie cocco seedling.

I have 1 8ball kush and 1 blueberry.
Bigger one is the 8ball.
1st pic. Blueberry x2.
2nd pic. 8ball x2
Grown in 75/25 cocco perlite.
Age from cracking through the ground: 2 Weeks
Feed light seaweed solution. Ph water to 5.8.
Amount of waterings 3 times with run off, the cups were light to pick up and were fairly dry before watering.
Warm climate round 28 to 30 degrees Celsius.
16 hrs light 8 hrs dark.
150 CFL light.
Im worried about the amount of yellow starting to occur, should I be and what can I do to try to ammend it. Today was the first day i added some canna cocco nutes at a very light rate of .2 EC.

Also the cotyledons have been damaged on the blueberry from me dropping it a week ago. I had to re-pot it. Can anyone please help? I'm thinking looking at other pics it they may be overwatered, although the medium was fairly dry each time ive watered, but maybe not dry enough.

Im no expert but it looks like nutrient burn, from what you said and how the tips of the leaves are damaged, try waiting until you get 3 nodes before ferts, be patient

All good mate. You think the seaweed solution may have burnt them? Today is the first day of canna cocco nutes, so it cannot be from that. My cocco was not pre charged with nutes but it was well rinsed and ph'd. Thanks for the reply.

Anyone else think they have had the same problem? This is my first go in cocco next time I will start seedlings in a 50/50 mix I think. The 8ball is looking more yellow today, tips of it are fading to a yellow. And one of its baby leaves are curling under so I'm putting it on overwatering. So i'll let the cocco get even dryer I suppose?

Thanks for all the knowledgeable help from everyone here lol. For anyone thats looking at this in the future this is what i came up with and i hope it helps someone.
To start with i'd let my medium dryout to much comming from dirt background. Watering more often.
2nd. The burn't tips was actually caused by a droplet of rain that had sat on the middle of the new growth unnoticed and sat back under the light and burnt! If you look closely its a perfect round burnt section which is even more obvious as it is growing out.
3rd. Under fertilized and the dropped pot caused the slight yellowing half wrecked coydolons & slow growth, along with the under watering and the droopy look. More nutes!