blue water, is usually water with a bit too much dechlorinator in it, which is a good thing, as our tap water had chloring and other chemicals which can kill fish, and the bacterial inhabitants in a cycled tank.
betta and guoramis, are both part of the same family...anabantoids...these fish both have labarinth organs which means they can take air straight from the surface air without using gills...its a natural selection trait which allows them to live in their natural habitat...fields of shallow water.
And as for the fish's personality...siamese fighter fish, are by nature fighters, so are guorami...a female guorami will fight for her territory, much like a female lion and another animal. As fishkeepers we must obey the laws of nature, or the betta with suffer stress...which lowers immune system and the fish is less able to fight off diseases...and therefore get ill....hence why he already has torn fins...could be a finrot case trying to heal. a lot of people think that bettas can survive in small bowls or smaller quantities of water....they shouldn't really be placed in anything smaller than 5 gallons....it would naturally have 100's of square miles of shallow waters to swim in. also, as already stated, only silk or real plants should be used with bettas and any other fish with long flowing fins, as they are very thin and tear easily leaving them open to infection and death. I am sure you already know this, but just pointing a few things out, in case any newbies are reading
thanks