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Sea hare eats colonial hydroids
I have had these practically cover my rocks. I had become completely fed up with them, and after hours of searching, I decided to try the advice from the danireef site, which is to try the "Blunt-End Sea Hare" (Dolabella Auricularia).
I asked my LFS to find one for me and within a few hours of putting it into my tank, he was munching happily on the myrionema hydroids. At this rate he should eliminate most of them in a week or so. Highly recommended. Of course, as with any biological control, your results may vary due to the preferences of a particular animal. But, I can say it's worth a try and a lot easier and safer than blow torches or horse de-wormer. Most LFS will take them back after they clean out your tank. Since they are very good at eliminating hair algae but have voracious appetites, they are almost like rental lawn mowers or carpet shampooers and most people return them when the food supply has been exhausted, usually for a small refund.
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