Cardinal tetras. Are supposed to be slightly hardier than neons, but that is probably not saying a lot. I'd check out other tetras if I were you, have a poke round the shops and then post in the characin forum to find out the hardiness of any species that takes your fancy. Spanishguy mentioned WCM's, they are a lovely fish, like slightly cooler water, so may not go well with gouramis, but fine with many corys.
You think so? Interesting. I like how you suggest a fish you've obviously never kept before. A newbie cant keep cardinals alive. They are NOT more hardy than neons. Don't suggest tetras to newbies. I don't like your fish suggestions generally. Rams? Come on dude. Don't even say the word. You go on to contradict yourself immediately and say maybe not such a great idea.
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I've only been in this hobby for around 2 years and some of the first fish i ever bought were Neon Tetras. All of which are still thriving 2 years on. I also own a pair of Bolivian Rams, who again are thriving.
So don't automatically assume that a newbie cant keep neons or rams because most newbies can.
Paul.