The bichirs and the plecos are your best long term option IMO.
But I do understand that a 4 inch fish in a 75 gallon tank looks pretty empty, so if you want to add a tankmate temporarily I understand. In that case you could add a smaller, less aggressive fish than the GT, and watch it like a hawk to know when to take it back out.
My recommendation would be JD in this case, but again, only temporarily until the GT is big enough to look like it fills the tank, or if to much aggression occurs before this point.
But I do understand that a 4 inch fish in a 75 gallon tank looks pretty empty, so if you want to add a tankmate temporarily I understand. In that case you could add a smaller, less aggressive fish than the GT, and watch it like a hawk to know when to take it back out.
My recommendation would be JD in this case, but again, only temporarily until the GT is big enough to look like it fills the tank, or if to much aggression occurs before this point.
