While my discus are sleeping, sometime under things, my angelfish pick a sleeping spot in the tank, around the mopanI wood, plants and ornaments- the angelfish defend their sleeping spots. It’s crazy, they challenge another angel not to come into their sleeping spot. kinda like when they lip battle, but one twitches & other challenges the twitcher. I’m have to record this next time. The discus are clueless, cause their sleeping when all this is going on. Anyone else notice this behavior in their angels?