When growing in small cups you should not use perlite unless you can tend to them like... like... shit.... like

ummm

Well you need to keep a very close eye on small cups cause they dry out fast...

Small cups dry out very very fast and perlite is not necessary... perlite is for aeration....

a 20% perlite 80% soil mix in a 1-5 galloin pot is GOOD..

YOU are LOVE