Your fish are gearing up to kill each other -that's what is going on. THEY DON'T HAVE ENOUGH ROOM Big fish go in big tanks. Put small fish in your small tanks not big fish.
Get the big tank first -then get the fish to put in it.
I live in Manchester, New Hampshire. Where tap water can range from 6.2-6.5, so I bought the water conditioner. It's a perfect city, where everything is close. Petsmart and Petco are only 1-2 minutes away from each other lol.
And I just returned the female baby flowerhorn, and the oscar. I kept the money for the oscar and return the female baby flowerhorn for a another flowerhorn because there were new flowerhorns and bigger one this time, about 2-3 inches. So I bought a male one, I was looking at those flowerhorns for 5 minutes and this one doesn't have stripe on the top fin and red eyes and red around it, seems like a red dragon which is perfect.
Hopefully this will help, the small and the big one should make peace and enjoy the tank. The 2 others flowerhorns tails were kinda ripped, and the other one which is more colorful mouth is kinda injured because it was fighting the fish in the tank. There were 6 same fish, I don't know what kind was attacking it and the flowerhorn ran away, if someone don't buy it in time, then it's will die.
I WAS ABOUT TO BUY IT< BUT DIDN'T HAVE ENOUGH MONEY, I COULD HAVE SAVE IT AND HAVE 3 FLOWERHORNS IN MY 29 GALLON TANK.