Not that I like central systems myself, but doesn't a good UV Sterilizer in the system kill any outbreaks of disease that can happen? I normally won't buy fish from a store that runs a central system and has one tank that isn't doing well. I won't take that chance even though all my tanks have their own filtration system and I use quarentine tanks for new arrivals. John ------------------------------------------------------------------------- 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://altavista.digital.com for "Apistogramma Mailing List Archives"!