The general rule with tnags is to try not keep them together if they are TOO similar. E.G. It is very difficult to kepp an Achilles with a Powder Blue or a Gold Rim.........same family, same shape. They will have a good chance of killing each other.
The ones that you chosen are a little less likely to do so. My only concern would be the yeillow and the purple. If you put them in in the order Kole, Regal, Sailfin, and then add the other two at the same time, you have a good chance of success.
Howere, like humnas, all fish are different and some are calm, while others are maniacs!
I have currently got a Regal, Yellow, Powder Blue, Sailfin and a Clown. That being siad, they are in a 300+ gallon tank. hope this helps