Help - Leaves Diagnosis

Day 27: Boost!!
Light Cycle: 18/6
Temp: 26°C
Hum:31%
PPM: 360
Water Temp: 22°C
Ph: 5.6

Notes:
- Today I added 1 tea spoon of FloraKleen and turn on the water pump for about 1.5 hr. this is suppose to get rid of the salt that accumulates.
- Also change the nutrient solution to vegetative state formula, and increase the ppm to 300-400 (real 360).
- I think I got a little carry away and top 2 of my plants (pics)
- Bought a humidifier, the problem is that it drop the temperature below 21°C, (ill probably set it to run for 15 min every 2 hr)
- I set up the water pump to run for 15 min every 3 hr.

Pics:




Questions:
1- If you look close to the first two sets of leaves they have brown spots I think it is because the mistake I made in the beginning (ppm of 1000 Stupid!!!), but it seems to be getting browner.
- Is it normal?? if not what can i do??
2- Is ppm 360 too much for them right now??
3- Every time I refill my reservoir I do it all the way until they barley touches the net pot, now my plants have a good root system should I leave more space???

these look a tad too young for heavy nutrients imo. the browning may be caused by nute burn.

Yeah, leave 'em more space and cut back on the nutes.

What they said; N and or K burn, or less likely > N def; Cal def.
Also make sure you are maintaining PH

What I did:
1- adjust the ppm to 260
2- Give more space between the Net pot and the water.
3- I set the water pump to run 3 times a day for 15 min.

I'll post some pics in a few days thanks for your advice.!!!

My ph is 5.5

The two most common mistakes among noobs I've noticed are over-watering and over-ferting. You did a tad of both but your new growth is green and healthy so it's just minor. Good luck to you.