I honestly don't know - i mean the leo are smaller than regular angels seriouslyfish suggest around 4 inch which makes them smaller than the cupid but would either they or the cupid go after ember tetra just not sure.That sounds very nice - will the ember tetras and pencilfish be Ok with the angelfish though? I mean I do actually have pencilfish with my big scalares with no problem so I guess the leopoldis may be less likely to eat them.
Well I don't want something that will hunt the frys - also i have 14 embers that were going in that tank if i used it for guppies; so changing the stocking i can either put them in there or put them in the basement where i never see them...I am not sure either, perhaps it would be safer to get bigger tetras?
Actually i'm willing to go with a colony which implies some breeding. In the aquarium i currently have a number of a. pucallpaensis - not sure how many but i think around 8 or 10; 8 cupido which have so far ignored them though one of the cupido is bulling the other 7 and a bunch of hastaus cory (15? 18?). The a. pucallpaensis females which much smaller feel comfortable eating with the cupido and after 2 years my large male pucallpaensis also feels safe coming to the front to eat while the cupido are there so in that aspect they have improved things. They are very affectionate but timid - if they don't recognize me for some reason they quickly scatter but as long as they can recognize me they will come up and eat 'from my hand'.If uou had a 4 foot wide and 4 foot long you’d be able to many more combos. The height of the tank does not matter to most dwarf cichlids.
So with that being said, in your current tank I would do the following:
Stay away from rams except the Bolivian ones.
Obtain only one type of apistos or just collect the males. A dwarf acara is a good choice. Make sure they have water chemistry parameters in common. I know you’re not interested in breeding so don’t buy pairs.
Find a schooling fish that will stay in the very top and another for the middle. Again choose the species for the water chemistry and parameters if the apistos you decide on.
If wanted add plants that match also plus driftwood, rocks, etc.
Be content with a beautiful tank!
I can’t wait to see photos and hear your choices.