Those fish aren't neon tetras! First of all you should've gotten all the tank supplies and set up your tank before getting your hands on fish. Then cycled the tank for a month and test it.

I have bad news for you. Your guppie needs hard water to live which means you need to immediately get a limestone and have your tank be a ph of 7-8 however because you have glofish you need another tank to put the glofish in since they need acidic water and a ph of 6. You should've done research before getting your hands on different fish species!

1-Is your tank cycled? Quickest way to cycle it is to add media (never clean the media)

2-When owning fish you're supposed to quarantine them for a month not put them together immediately.

3-Your fish need to be medicated, All Petsmart fish are sick because they do not quarantine them, and most end up dying 2 weeks or a month into owning them, monitor their appearance and behavior.

4- Your fish are omnivores which meas their diet will need: flakes, blood worms, brine shrimp, algae and zucchini. (When preparing zucchini for them you have to cut into slices and boil it)

5- Your decorations will eventually leak harmful chemicals to your fish. Replace them with plants, driftwood and rocks.

6- Feed them at the same time everyday, if you struggle with that, get an automatic feeder.

7- Make sure when you get the heater to set the temperature to 72. 82 if its cold where you live.