Stocking a 30 gallon

[Thethorne]

So I’ve been doing some research. I currently have 7 guppies and 6 corys in my tank. Thinking of adding 12 celestial danios and 12 gold Barbs or possibly ember tetras. Would this be over stocking the tank or will that be ok. Thanks

 

[JuiceBox52]

I wouldn't add any of those with how hard your water is. Have you looked at some of the rainbowfish species and other livebearers?