i bought a pair of blue rams for my 29 G a few months ago. they didn't waste any time and started spawning right away, and have been doing that every 10 days or so since then. long story short, the male died and the female was alone for maybe 3 months. she's really doing fine and her color is really intensive. last week i bought another male from the same store and put it in the tank. at first the female came right to the male and they seem to be flirting around. however the second day they became enemies, flaring at and sometimes fighting each other. even my young daughter notices that they are "staring at each other". this really puzzles me. are blue rams like human beings, they really need some chemistry between each other to help them pair up? i have a male angelfish in the same tank and later on bought a female. they seem to pair up with each other just fine, and have been spawning every 2 weeks or so.