Exactly the same experienceMine liked caves and swim thrus. They swam in and out a lot, the more hiding places you make, the more they will stay out in the open. They feel like they have a place to go if SHTF.
Same here all of my angels like to swim in and out of caves. They really likes hiding places.
now that the emperor is getting huge , he still likes to hide in large caves. also he needs a lot of open space, so best aquascape should have both many caves of different sizes and open space
also @Katrina71 you will need open space for the tang