Unless they are very small, 1"/2.5 cm or less, separating A. agassizii from A. cacatuoides should be fairly simple. Male aggies have a low even dorsal fin, round (when <2"/5cm) to spade shaped tail fin, metallic blue color bordering both sides of the suborbital (cheek) and postorbital (part of the lateral band running from behind the eye to the edge of the operula (gill covers), and no abdominal stripes. They also show the agassizii-group lip spot. A. cacatuoides males of the same size will have extended front dorsal fin spines, a squared off back edge on the tail fin with upper and lower extensions (lyretail). They don't show the metallic borders on the suborbital & postorbital stripes and have 3 to 4 rows of zigzag abdominal stripes below the lateral band. Double reds, whether aggies or cacs, will have red in the the dorsal and tail fin. Hope this helps. Mike Wise JerrCarol@aol.com wrote: > By the way the guy I got them from said their > double red cacatuoides but, the pics I've seen > they look > more like agazzii. Oh yeah one more thing when I > see Sp after the name of an apisto what does > that refer too? > ------------------------------------------------------------------------- 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"!