Jason, Another consideration on the central filter is the spread of disease, with a central filter, if you got something in one tank it would end up in all of them. I like keeping them all isolated. (on another note if you get plant algae it won't spread as easily either). It is funny how each tank will find it's own balance. Kathy ------------------------------------------------------------------------- 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"!