Can i add these fish to my tank?

Those fish should be fine I'm a little reserved on the Glo only because they're not true fish and have been genetically engineered. The shark should be fine it being one of the Lebeo genus they are only Territorial with fish of the a similar species of which you have none, Red tail sharks sometimes get narky with red fish but its nothing overly stressful. I'd go with the cardinals as I find that over the past 10yrs or so they've been more robust than Neon's and are one of the only fish not susceptible to Neon tetra disease.