.week and 3 day old plants

Hey guys my plants have been hanging in pretty good so far they are in solo.cups up happy frog with perlite added I use tap water most of the time im using four f40 t12 4ft floro tube lights on my plants the tips are yellow and I can't figure out why I tested thhe soil and it was really towards 7.0 or higher so I am using some fish emulsion to lower the ph and give them some nitrogen any advice right now?

Heres the pics

Why are you feeding them?
Why are you messing with the ph?
Are you filtering the chlorine out of the water?

I just started feeding them yesterday night because I thought it could be a nitrogen deficiency or lock out from to high of a ph the fish emulsion got alot of nitrogen and helps lower the ph im trying to get it right around 6.5 or so

those are pretty young to be adding food to the soil already... that happy frog should have planty of food for a seedling for at least two weeks...but your handle name kind of says it all..."poopbuds"...hopefully youll get it figured out

Just throwing this out there..... Do you have drain holes in those Solo cups?