If you can test your water parameters to see exactly were they are that would be a big indicator of whether you should or shouldn't.
Another question to ask yourself is when the last water change was performed.
Personaly if my parameters were good and i hadn't done a water change for a few days i would do 25%.
Sounds like your water is good but I'm still with my fellow Aussie Gibbs in suggesting that you do say 10-20% change every couple of days for the first week. This will assist your tank in ramping up to the new bioload. 18 fish is a whole lotta new stuff going into that little ecosystem!
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