It depends on the invertebrate. That's a really broad range to cover.

Some love dirty water, some can't survive in anything less then perfect water conditions. I've seen huge beds of Xenia and anemones growing at the outfall of sewage plants. You wouldn't find SPS growing there. Both are invertebrates. Just cause someone posts it on the net doesn't make it so. While the net has been a huge help in the hobby, all it takes is a computer to become an "expert." I'm sure whoever posted the info you saw was well intenioned, but unless you really get specific on some things you can be as dangerous as you are helpful.

Go to wetwebmedia.com for some good advice on how to cycle. Its searchable.