I have kept hydrolycus sp. of a few varieties and was hoping to keep odoes in the future. Sadly, I just don't think that they are very suitable for home aquaria at all. They (payara in particular) die off young, don't eat, or grow too large. Even if it does grow to adulthood - both species are dangerous and once again, payara in particular need fast moving water and massive MASSIVE tanks. No, I have not done much reading on odoe pike, but I intend on doing so, especially now.That's an armatus... lol. Take a look at the sticky. Odoes don't get much bigger than a foot. They're not super active they hover majority of the time. I'll agree they like company.
Curious have you kept either? Or done much reading on them?