I think that most people's concensus would be to tell you don't get any tangs. Your water volume and tank length aren't great for tangs, the yellow belly you currently have will easily out grow your 115g
Wait the year till you upgrade. Buy fish for the tank you have now not one for the possible future. And yes most people are going to tell you the same thing as the minimum tank size for the powder blue and your regal are much bigger than what you have now.
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