David, It sounds like you have A. agassizii Hüser Redtail, a very pretty domestic form. See Aqualog SACII p. 18. They will not interbreed, but will fight for territory with your A. cacatuoides. A 20L tank is kind of small for 2 pairs of highly polygamous & territorial species. Mike Wise "David K. Bowers" wrote: > Hi all,I have a 20 long that currently has a > pair of cacatuides in it and 6 neon tetras as > dither fish. My LFS has a gorgeous pair of > something called Ap. Red Huser that looks to me > like agassizi. First of all has anyone heard of > this trade name, and secondly if I buy them and > put them in with the cacs do I have to worry > about interbreeding? Thanks,Dave ------------------------------------------------------------------------- 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"!