I was browsing aquascape today and I noticed that they had some cichlids,I have been wanting to get for the 125 or just by itself in another set up.The one I spotted is a African cichlid,paratillapia polleni and for a South American I have spotted,which is a vieja argentea.Which would be the better purchase?I hear the vieja are extremely aggressive,but people are saying the aggressiveness is similiar to a Jack Dempsey and that paratillapia polleni is similiar to a Oscar's personality.