what are the signs of ich?

Fish can be harboring ich parasites in their gills before any spots appear on their skin, so the first sign may be rapid breathing and/or 'flashing' - the scratching behaviour surf describes. They may lose their appetite as well. Try looking at your fish under just actinics; ich seems to show up better in dimmer, bluer light, and you may see spots that aren't nearly as visible while the daylight bulbs are on.
 
wow. This thread is going to turn into an argument now! :) Run hyposalinity (my favorite), or dose copper. If you need help with ich feel free to PM me. I had to take care of it last December, and haven't had any problems since...
 

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