From your list you don't mention sizes. Even if the chosen ones are small, the 75 is too small for that grouping.
The disposition of the Clown Trigger is pretty bad. It has a bad reputation for being aggressive after it becomes established and grows older. Mine always seems to turn on me!
The Maroon Clown will liken be eaten by one of those others unless you start with a very large female, which returns us full circle to the shortage of space for this grouping.