good feeding , never life feed , big tank , getting them al small , water change , alot of plants , good filtration , and a bit of luck
btw the smaller chilclids are't so wussie as you think the jurupari's wil become 25cm and ther active and they eve steal food from the oscar , my discus even stealfood from the oscar.
and the heckelie i have ( yes i now its had to be at least 3 , but its a wildcatch and i want that the others 2 are olso wild catch ) is one of the meanest i he want's to go somewere he goes there does't care about anything .
greets
and the tank said but for you
2.5m 70cm 70cm
with an 2m 50cm 50cm sump