brichardi species tank or other fish for me.
In a LFS I saw a breeding pair (on sale for £30)
They were in a tank with LOADS of fry and a 7" Common plec. Even though the tank was 5 foot long every time the pleco moved the male went for it until the poor thing was pinned against the furthest corner.
If you want to breed then just a pair in your tank with nothing else may work. Anything else in there will get bother to the point of death
In my 4 footer I had a breeding pair and it was hell on earth (or in water!)