Had to watch with sound off, but visually a good video, thanks for posting. I have two Koi female Betta, one with the blue based colour, VERY similar to one shown here, and a red based one that from observation seems much less common, parts of it almost brick red. Also a couple of Dumbo's, one pure grey/silver, the other has maroon nose and tail, also a more reclusive midnight blue. They all co-exist quite happily in a large planted and wood decorated tank with five Koi Angels and three pure white Angels. (And some Cory and Zebra snails). There are also four adult Bolivian Tetra in there. Again, NO issues at all. I "only" have three tanks!
