Bala's are peaceful, they won't go round ripping bits off your other fish (they may swallow a few small tetras if hungry or bored when big tho).
Yeah the SAE's are great if you get the genuine ones (there are 3 types similar) My SAE shoals WITH the 4 balas i have!
* Siamese algae eater = real Siamese algae eater = SAE = Crossocheilus siamensis
* False Siamese algae eater = Siamese algae eater = Thai flying fox = Siamese flying fox = colorful flying fox = false SAE = Epalzeorhynchos sp. or Garra taeniata (they do not know)
* Flying fox = trunk barb = Epalzeorhychos kalopterus
It seems that most places label these as "flying foxes" or SAE's and they are often mixed together because they look very similar.
Siamese Algae Eater or SAE:
The true SAE has a jagged black horizontal stripe that goes all the way to the tip of the tail. All of the SAE's fins are clear. The black and white and their contrast are more intense than with the other algae eaters below.
False Siamese Algae Eater or false SAE:
The false SAE if usually found in shipments of true SAE (or the other way around). Unlike the SAE, the black stripe ends at the beginning of the tail. Often, if one goes to buy SAE's in a US aquarium store, they may in fact be all or mostly false SAE's. False SAE's may have some red around the mouth and a yellow tint to the fins. My false SAE had some nice gold and red on the dorsal fin. Mine was sold as a flying fox.
Flying Fox:
Just like the true SAE, the flying fox has a black horizontal stripe that goes all the way to the tip of the tail. Unlike the SAE, the edges of the stripe are smooth and not zagged. The flying fox may have some rainbow-like coloring on the fins. It is more pretty than the other fish mentioned on this page. The black horizontal stripe extends to the end of the tail like the SAE but it is much stronger and broader.
From what i read when i researched this a while ago, only the true SAE will bother with algae when adult the other 2 may when young, also the other 2 are more agressive (which seems to be correct from what i have seen).
This is a pic of my false one in my 165litre tank.
Its almost black on the top, the real one is more dark grey/silver with dark lines where the scales are, it also has the black centre stripe all the way to the tip of tail as described above.
Anyway the SAE's mix well with balas

Can't wait to see your new tank up and running, i'm sure it will be awesome
