Agreed with Star on the RTBS they also have issues with loaches quite often because of how similar they look. It is also important that you get all one species of loach in the same manor as you would get all the same of one type of tetra.
As for alternative tetras there are quite a few that shouldnt get eaten how about flame tetras or emperor tetras?
And afraid balas are still a no no even in this size tank IMO a good alternative that would look exceptional in your tank I reckon would be rose line sharks. Very similar to balas but more colour and half the size need to be in a group of about 5 or so though
.
Wills
As for alternative tetras there are quite a few that shouldnt get eaten how about flame tetras or emperor tetras?
And afraid balas are still a no no even in this size tank IMO a good alternative that would look exceptional in your tank I reckon would be rose line sharks. Very similar to balas but more colour and half the size need to be in a group of about 5 or so though
Wills
/www.tropicalfish4u.co.uk/Fish/Freshwater/Barbs/DenisonBarb
looks good to me 






