What a lovely healthy looking tank :D

Thank you! I just wish my phone would pick up on the colours more. The plants front center have such pretty red stems and leaf undersides.

what kind of fish do you have in there? it looks lovely!

Bristlenose pleco
Hoplo catfish
diamond tetra
Zebra danio
Blue rainbowfish - Half a decent shoal. No one sells them. I'm looking wherever I can but no one seems to breed them.
threadfin rainbowfish
bosemani rainbowfish - I only have one. He was surrendered. I'm still looking for a shoal for him :/ no one can find them.
Platy - 3 'special' babies. These lil guys are the ones I can't sell because of issues. They do fine with me though.
Guppy
Molly
Pearl gourami
Dwarf chain loach
Columbian giant ramshorn snail
apple snail - Accidental import. Given to me because I will absolutely not release it or breed it.
sulawesi snail
nerite snail

Gosh im so jealous *-*
I only have a 20g but love my fish dearly. Do you have any advice for guppies? Ive never been successful in keeping them. All the parameters are fine (as far as chemicals, ph, temp, etc) but they always die off. :(

Guppies are very poorly bred. That's the main issue with them. If you get one to live a year, you're pretty lucky. They can breed from a pretty small size and usually will do with their siblings. As a result, they're very inbred unfortunately. On top of that, people breed them for appearance rather than health. Your best bet is to get fry, less then an inch long. They can adapt much better then their parents. Though you wont know what they're gong to look like with this method. Other then that, I don't really have much advice, as I've had bad luck with them also. The ones I have left are ether babies (4 of them now) born a few months ago or the couple females that are hanging in there. There's some tiny fry in there but the other fish will eat them, no doubt.

thats a shame, theyre such beautiful fish :(