Interesting, but it'd need to interact in ways we don't understand. If it interacted and formed life like we know it, it would need to clump, which it doesn't.

Interesting, but it'd need to interact in ways we don't understand. If it interacted and formed life like we know it, it would need to clump, which it doesn't. For a dark matter candidate to behave correctly, particles need to fly right past each other, heedless of one another except for gravitational effects. Never even collecting into clouds as interstellar gas does. Who knows though, the interactions between them may not alter their trajectory, but may be so complex that they can support self replicating patterns.