1. What is their usual aquarium size/length?
I have 2 - 17". Started at 10" -11" back in april. I used to have a 24" one as well, (it's for sale and local to you..)
The 24" is in a 210 gallon (6x2) right now..he was in it with 2 endlies.
2. Are they prone to DE?
NEVER seen any with DE, the 24" did not have a DE
3. Are they as passive/unaggressive as silvers?
All my blacks are very easy going. Never hit the lid or going on a crazy aggresive spree. I have had 7-8 blacks to this day.The smaller ones are so tame, they let me pet him as they know they're gettign fed. I caught the 24" with a 5 gallon bucket nad he goes right in without a fight..he's very gentle for his size..
4. Are they real jumpy like silvers?
Not at all, leichardti is the worst when it comes to jumpiness. My Lei thinks he's the king of the tank, he messes with the silvers, but never touches the black.
Thanks.
You're welcome