Originally Posted by
spanko
http:///forum/post/3295830
PROS
Bioballs and biomedia in general provide large amounts of surface area where water and air are constantly being circulated around them. This is a perfect breeding ground for nitrfying bacteria, the bacteria that convert ammonia to nitrite and nitrite to nitrate.
CONS
They do require a regularly scheduled maintenance program to keep detritus from accumulating on them.
You bet! Especially for tanks that don't have large amounts of LR. I've see several posts that you need to regularly scrub each bio-ball. Don't do this. the slimy coating is home to nitrfying bacteria. just give them a whoosh in tankwater to remove loose crud. Water from a water change is fine.
A downside (if you consider it that)--they will do nothing to remove nitrate, just the more dangerous ammonia and nitrite. But, LR or an expensive reactor are really the only filtration methods that will remove the nitrate anyway. IMO: they are excellent filtration media for newer hobbyists or those with fish-only tanks who aren't ready to spend the $ for a sufficient amount of LR. Most of my filtration now is LR; but have kept many very healthy tanks for years with bio-balls being the main bio-filter media.