Originally Posted by
SCSInet
UV sterlizers are worth the investment provided you understand their role accurately. They are a way to kill free floating algae and parasites if used properly. They are NOT an excuse not to quarantine, do water changes, or otherwise maintain your tank. In other words, they are a helper, not a cure for piss poor aquarium maintenance.
KIM- they will also take out some good stuff too but not all of it.