I don't think he is referring to a Marine Cuda what you had was probably a Red Tail Cuda or A. Falcaltus-don't let the name fool you they are not aggressive fish atleast compared to a cichlid-there are places that sell them online-if you are really serious about getting a fw cuda-get them in groups a friend of mine has a 180 gallon with
1. 7 Red Tail Cuda
2. 5 Hujeta or Rocket Gar
3. 5 Mosaic Gars
very beautiful tank most of those fish on the list get bet. 10-16 inches and do better in schools-but never mix them with cichlids.