I am pretty sure the chiclids will eat guppies and other smaller plecos maybe
also, a 35 gallon is too small for all of the fish combined
If Electric Blue Acara are the same thing which used to just be called Blue Acara I've kept them in the past along with Yellow Acara. If this is the case or they have the same type of behavior they will definitely eat the guppies. I used to feed my Blue and Yellow Acara feeder guppies and golds.
Blue Acara can do fine in a 35 gallon tank although it is sort of border line. The thing is that there would also be the guppies (for a short time) and the plecos. Especially the plecos will add a large bio load. Actually, if Electric Blues are the same as the old Blues, they can get to be 6+ inches and also add a lot of bio load. I personally would not add the Acaras.
You could look at some types of dwarf SA cichlids to lessen the bio load but they would still be a danger to the guppies.
There is also the fact that SA cichlids need soft water while guppies, being live bearers, need harder water. Any way you look at it it is just not a good match.