Like gardening, I think any successful tank hits this dilemma. If you look in the wild some tabling SPS will span 8+ feet so given their design, left unchecked each one of our tanks would end up having 1 or 2 corals covering every square inch.
I find I have pest "TX trash" palys that have reach plague proportions. Monti cap needs to be cut back every few months and a couple of millis and my large soli are starting to shade out other corals.