Clarification: Singles are fine if in a tank with similar temperament fish (community setting). They often seem to mimic the other inhabitants behaviors. I have had singles, twos and multiples in a single species tank and I found, especially if they're young, that they can be skittish and reclusive. "Older" results in "bolder" (ie they become bolder with age - sorry about the 'poetry). I kept 6 young Paratilapia sp Andapa (from ciclasoman/Jose Gonzales) in a 25G tank by themselves just after I got them. They did okay but not quite as good as I hoped. So I moved them in with some P dambabe into a 45G. They became very bold and aggressive to one another and the dambabe. So I moved them by themselves into a 70G by themselves. They hid all the time and barely ate. I then moved them in with a bunch of young menarambo into a 90G. They now blend right in and chase about and feed heartily. No damage results. I kept a large pair of polleni 'Fony' in the mid 90s in a 70G. The male hemmed the female into an inverted flower pot and never let her out. She would have starved to death if I hadn't intervened. I put them in a 125 long with a couple of tilapia, and within two weeks they spawned. So IME, singles are okay if in with other species. Multiples are fine in groups of like species, and best in with other species. Not saying that pairs can't be kept successfully. But the pair bonds in Madagascans are fragile at best. So with more fish present, a more stable, non threatening environment is created. No more ramblings, RD. Tom sorry for the diversion.