There are some rather hilarious youtube videos out there of yoyo loaches destroying tanks.
As far as cories go, they will be a destructive force for as long as it takes for the HC to establish a secure root system. If you just poke the HC into the substrate with cories, then you can be that they will make a mess of it for a while. This is one of the advantages of doing a dry start to planted tanks, as it allows the root system to establish itself before fish/current become a significant factor.
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Algae creates 75% of the world's oxygen, so really we're all just doing our parts...
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