Tito is right about the first question, but here is the answer to the other two..
are copepods and isopods to small to really notice? Some, but you can see most, strolling on sandbed,lr,corals,ect..They are most active at night and when lights are off.( due to predators).
do mini white brittle stars reproduce by splitting or sexually?
Sexual , Baby Bristles will mature rapidly and reproduce to levels that are consistent with the available resources (food and space) in your reef tank. As for reproduction, it involves the external fertilization of eggs by spermatozoa. The fertilized eggs develop into planktonic larvae. The larvae typically go through two stages, called bipinnaria and brachiolaria. They are bilaterally symmetrical and have bands of cilia used in swimming and feeding. As the larvae gradually metamorphose into adults, a complex reorganization and degeneration of internal organs occurs. The left side of the larva becomes the oral surface of the adult, which faces down, and the right side becomes the aboral surface, which faces up. Then larvae settle to the sea floor and adopt their distinctive adult radial symmetry......
