Hard to say, spikes and their effects are difficult to predict...
How long has your tank been running with just the live rock? Problem is that although your tank has cycled, it has cycled to the bioload of an empty tank. To prepare a system for a significant bioload increase you need to provide it with a source of ammonia to propagate nitrifying bacteria.
Clowns are really hardy. I would think that a small pair would be ok. Not sure about the inverts. Speaking of inverts, I do not subscribe to the large clean up crew philosophy. It only increases the bioload, is irrelevant if you don't overfeed, and consequently is an unnecessary expense. IMO you could drop the turbos and the blue legs and it would still be plenty.
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