How long should I wait to reintroduce fish...

Inverts generally cant catch the same things fish get, such as Ich or Velvet, as far as temperature goes it depends on what inverts you have.
 
Orion, I'm confused. I did a search on velvet and found this response from you last fall:

"I would leave the tank empty, and run it at an elevated temperature--this will decrease the time it takes for the parasite to run it's course, and a temp above 85 may even help kill it off. Treating marine velvet is different than treating ich--velvet can generate dormant spores, while ich has not been shown to include a dormant spore stage. So, the time and heat treatment will work against ich, but possibly not against velvet."

Which answer is right?
 
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