Silk plants! the ones you have looks rough :(
and hard. he probably likes the side cos being next to a wall feels like a tight space to wedge into >.>
mine is always busy being curious :P
he's just a plain old VT but I've had him since a baby and tried to give him the best environment to hide/swim in. I keep the center of his tank open whilst heavily planting the sides so je can enjoy his life in the tank :)
so during the day he wiggle butts in the open, and at night he'a nowhere to be found, usually hiding somewhere to get his beauty sleep
your fish should be very comfortable and not skittish... do you do anything that might frighten him?
this is Kuro