Mormyrus questions

I just received my Mormyrus longirostris from Wetspot. Right now he is about 3.5 inches, and is in quarantine with the other fish I received. I plan to eventually put him in a tank with schools of Elephant nose fish and baby whales. If he is too aggressive for that tank I do have others he could end up in.

But my question is regarding what the differences are between the major species of Mormyrus, in terms of personality, aggression, size, etc. Looking online at iucnredlist it said the longirostris are schooling but kannume are not. Would this affect how compatible they are with their own specieS? Also both species can get over two feet, but I am wondering if anyone has ever grown any Mormyrus anywhere near that size. I have never seen pictures near that size. If I could get it over 1ft I would put it in my 700g... So size isn't a problem, I am just curious what to expect from those who have had them long term.

Ok, thanks! I am trying to recreate a specific tank of mormyrids that the owner has been posting videos of on YouTube for years, so that is why I am interested in compatability and groups. I don't plan to try adding the dolphin until after the EN and baby whale schools are established. If it is too aggressive I will move it else where.

did you notice a personality difference between the Kannume and the Longirostris? What kind of growth did you get? Is it reasonable to try to grow it out for my 700g, or will it never get that big in captivity?

I've posted these videos on here before, but here it is again. Looks like the owner has 4-5 dolphins
[video=youtube_share;_68lsiu74OQ]http://youtu.be/_68lsiu74OQ[/video]