Max size in captivity is more likely 14-18+" but may take many years to get to 18"+. Even getting them to 13-14" takes 2-4 years when they are already at 12". Never seen a 36" before but who knows maybe somewhere in it's native habitat. If polypterus palmas buittikoferi was thought to gorw of max of 13" but later they found a wild caught at 20".
Hmm... Thats what I'm scared of. I the whole top is covered, but the back is open a few inches above the tank. it has a canopy, no glass lids. Maybe I will wait. I don't like finding jumpers lol
Trust me, you want a tight fitting lid with no openings! I had a rope that escaped. I didn't realize that it was gone until it was too late. I found it stiff as a board behind my tank.