Actually the common name for the angels is scalare. The altums are another type of angels that have taller bodies and differences in their stripes. Altums have only been bred in captivity on a very small handful of times. In a tank thats 3 foot long I would put at a maximum of 3, 2 would be alot better though. When it comes to breeding, its alot more involved then having livebearers. Read the breeding section of my website for more details.