hello Brian I know red/gold is a color variety of Aggies but never heard it used for Cacatuoides, most likely just a normal red cacatuoides, all have yellowish bodies and can have red fins or orange or clear fins. As to the size tank for a harem of 1 male and 4 ladies, i would not go smaller then a 20long. I would recommend a 30 gallon or a 33 long for that group if you dont want to remove fish after spawning. A 15 gallon tank would be fine for a pair but too small really for a group like that. Females will be rough on each other in a small tank not the male being rough on the females. Remember that when you have multiple females in a tank, use more flower pots for hiding spaces then you have fish, ie 6 flower pots for 5 fish, then they can pick their hiding spots and there is always an escape hiding space if chased out of theirs. I've found this to be a good thing to do. As for other tank mates. If you really want to breed them and not remove fish, dont put any other species in that tank. No sense making competition out of non species fish. Of course these are just my suggestions as to how i would do things and done them sucessfully in the past and still do them 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"!