A word of caution here - I may be wrong, but I'd hesitate to suggest UV sterilization for a large, distributed system. For a single show tank, perhaps. But not in a breeding or growout tank, nor in a central system feeding many freshwater tanks. By completely removing most pathogens, you may inadvertently remove the ability of young fish to develop resistance to these same bugs. UV for marine, yes. (Temporary) UV for bad algae outbreaks, yes. But I question the reasoning behind UV for long term maintenance in a freshwater setup. ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://www.digital.com for "Apistogramma Mailing List Archives"!