I would guess so, or at least potentially so. Having said that, I've blasted chaeto with tapwater to clean it out (it's a great trap for detritus) when moving from one tank to another... and it lives through it so you could clean it if you thought it had hitchhiker spores or whatever of the "bad" algae..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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