IMO/E, biobale is nothing but a nitrate trap and a cleaning logistics nightmare. Who wants to pull plastic strips out of their skimmer to clean on a monthly basis?

For my money, more water volume ALWAYS = better, whether the sump is being used for further filtration methods, or just to provide a larger water volume. Besides, all the glasscages tanks have the option to come drilled with a nice glass overflow from the factory -- why not take advantage of it?

-Justin