I have three festivums in a tank with angels and blue rams. They are extremely shy. Have plastic plants with wood tree stumps. The festivums swim around tank when you watch from a far distance. As soon as someone comes close to tank they turn a dark shade of color and hide in plants or behind stumps. They hide so well most people can not find them and if you don't know their, there in the first place you would never see them. Tank looks as though there is only the angels and rams.
I really liked the way they look and thought they were really cool, but was pretty disappointed that their never seen , unless you watch from a distance. In the fish store their was about twenty stuffed in a 20 gallon long with nowhere to hide. Had no idea I would very rarely see them again!!!