My orchid dottyback (Bill) has been alone in a 20 gallon tank for around 6 months now, but I came home yesterday to find clumps/strands of white spheres coming out of her vent. they are gone now, i'm assuming they fell out. has anyone else had something similar happen? is it a symptom of anything concerning? She's active, eats aggressively, and none of my corals are acting weird either. thoughts?