i think a nice eel would look pretty sweet, as long as you dont go with a giant like a fire or tire track eel, but a group of smaller loaches might be good if they are big enough not to be eaten, i am a fan of my yoyo loach and need to get him some pals, or like many have said a bichir would be a nice addition
To OP- If it were me, I'd just do a school of something like SD since it's only a 75g. If you want a "different" look you could always get some wide bars or red hooks.
Thanks for opinions guys, female JD and Peacock eel seem to be grabbing my attention ill make up my mind between these 2, i also saw a nice little green terror at petland u guys think theyd get along or is it not worth it