tom - Nest spawners generally need a pretty clean depression area for spawning. The male fish works diligently to "clean" all lose materials from the nest area, thus dead algae will almost always be removed from the nest site. If algae is in the nest it may not be an active nest.
TO ALL READERS: I found this very interesting information about copper sulfate. How soon will the EPA of other states follow the state of Washington's lead?.
Copper Compounds - Copper compounds are no longer allowed for aquatic use in Washington state waters except under the NPDES permit for Irrigation Districts.
