I don't know. What type of scooling fish likes to swim in and out of objects with lots of holes such as sunken ships?
(Sorry, couldn't help myself)
It's a fairly specific behaviour you're after. There's a number of tetras that can school quite nicely or at the other end of the spectrum is something like clown loaches (if you have a big enough tank) which when in groups, will often wedge themselves in holes with each other.