Cause of leaves curlings upward and some yellow tips on small plants Please help ASAP

I had a problem prior to this one which some leaves were drooping which is not the case any more.. so you can obviously tell this is my first time..


1)Now i have this big plants which are a week and look pretty healthy but the newer leaves are curling upward..:mad:

2)and there on my other unknowns they are growing slow but are growing nontheless the only this wrong is im starting to see some yellow tips.. very light but i do see them any advice?

my only vnetilation during day is opening the closet door but it is always 80 degree f in side rarely below that. any suggestiong please help asap..

im thinking it the PH but need another opinion.. i normally use tap water or distilled water which ive heard has a neutral ph

Tap water rarely has a neutral pH. You should probably stick to the distilled water, and add a bit of pH down to it to get it about 6.0, and use that to water.

Curling upwards sounds more like you might not have enough oxygen at the roots or it's getting too hot.