Seaman
Shrimp gumbo, shrimp salad etc...
4 nandus nandus or 4 butis butis will work, or a mix. They are camoflauge ambush predators, very cool. Also exodons will work. You have to get good filtration and be willing to do water changes every week because they need to be housed like african cichlids, a little overstocked size wise to spread aggresion. Id say 15-18 would be ok in the 40....these have to be my favorite...always moving and will eat anything from bugs to flake to feeders. Remind me of mini piranahs to a point. Just be careful of tankmates.