Well can't get many pictures of the tubes and towers but so far:
Natal ignores his stack tube but has started building a bubble nest around his floating tube and has shoved it right where he wants it.
Nereus likes hiding behind his complex, but I have caught him in it. He all but ignores his floating tube, except for shoving it around a little, unless I "tell" him to (have him follow my finger to swim through it).
Thanatos has ignored his stacks but I caught him exploring the floating tube.
Mako has explored tower and tube but prefers to patrol his plants.
Vincentius ignores both his tower and tube.
Visit my Betta Blog to see my finned friends in higher resolution!