I'll have to check my Eclipse tank and see the mechanics of it. I know the Marineland filters have small caps that fit over the "axle" of the bio-wheel and then snap into place in a bracket which rests in the filter. If any of that is improperly assembled, the bio-wheel will not work as it is supposed to, but I can't remember if the eclipse has these parts or not.
As to tankmates, I've found glo-light tetras make excellent tankmates for bettas, as well as black neons. As mentioned, you will need to make sure the tank is cycled before adding any more fish if you haven't already cycled it for the betta.
|