[Raul-7]

I'm not so sure, but I think C. keei and C. longicauda would look nice on the right side, and maybe you can plant Cyperus helferi along the back left.

IMHO, you should probably invest in a canister filter. Choco's need excellent water quality to keep them from wasting away.

 

[Raul-7]

You need to create hiding spaces to relieve aggression when you have a biotope full of Chocolates. Although they are timid and shy in a community tank, they show their darker side when they are in a species tank. That's why you should plant an area filled with C. helferi, Hygrophila, or fined-leaved plants to create seclusions for less dominant fish to hide away from the alpha male and female.