I
may actually doing a very similar tank. I am growing out a group of 6 sveni with a group of Guianacara along with some altum angels for my 220 gallon. All fish are small but should be an amazing tank once they're grown. Doing a nice amazon biotope too with itA good friend is keeping a group of six G. sveni and 10 altums in a 240 right now with no issues, other than the fact that sveni are very aggressive eaters. Just make sure the altums are getting enough food.