Well the one from Petsmart is probably Eleocharis parvula. I bought mine from Petsmart too in that gel package and in my experience, it will go through a melt before it acclimated and bounces back. That was in one of my tanks (12g nano cube) and carpeting nice and very green after going through that ugly phase. Then i decided to transfer some to my newest build (26g bow front), i planted it about 2 months ago and its barely starting to show green and shoot runners. It seems to be finicky at first but once it sets in, it will grow in nicely. Both tanks i have it in are medium to high light with co2 injection and PPS-Pro dosing regimen.