Last week I asked some things about A.tucurui and did get some info back (thanks for that). I'm 99% sure it really is tucurui due to a pic i saw. I bought 4 speciman (2 males, 2 females, it was all they had!) and placed them in a 150cm tank with 4 juvenile P.altums. One of the females is already yellow and according to her body she layd some eggs (haven't found them yet). In my oppinion: A big difference with other apisto's is their aggression. Esspecially the males can't be kept together. My tank is 150 * 50 * 50 cm (375 liters) and it's still too small. The "father" also hunts down the other (not-yellow) female. Logical conclusion: I'll split the two couples later this afternoon in order to try and get spawn from 2 couples, especially since they seem extinct in nature (read mike's and bob's reply). With two seperate couples the spawning-chance is of course much bigger! I'll keep you informed. I also like to know something about the waterchemistry of there (disapeared) natural habitat. Jan Visit me at http://home-2.worldonline.nl/~jbusser/index.htm