I think you'll need to do "leaf changes" every few weeks/months when the old leaves began to break down.
I've done angels + Apistos before in a 90g and it worked reasonably well. I had a crazy idea to do an overcrowded all male Apisto tank, but only managed to add a few dozen males (3 species) before running out of money. Some were a bit territorial but no serious aggression, and it was a fun experiment. It would be more difficult to keep everybody happy if you go with pairs/trios.
I've done angels + Apistos before in a 90g and it worked reasonably well. I had a crazy idea to do an overcrowded all male Apisto tank, but only managed to add a few dozen males (3 species) before running out of money. Some were a bit territorial but no serious aggression, and it was a fun experiment. It would be more difficult to keep everybody happy if you go with pairs/trios.