Tripling tank size, fish suggestions?

2 hours? I do think they are great, I'm just worried about screwing up and killing a bunch of expensive fish
 
When I first started reading about discus I became so worried that if I kept them I would stunt them or just do something really wrong. After thinking it over for a bit longer I realized that I could definitely do it and I was just psyching myself out. I still haven't kept them yet but I'm looking forward to that day XD

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