Maybe my question should have been, is it OK to put a scarlet cleaner in with a lawnmower blenny??
The new cleaner has been MIA for at least 36 hours now... Basically I only saw it for a few hours after being put into the tank and I've never seen it since.
On a somewhat related rant/whine .... It really is amazing to see what passes for "large" these days. This $30 cleaner was barely larger than the mysis we feed (except that the antennae were much larger of course). So I'm thinking this is not boding too well.
Tank inhabitants (aka "suspects") are: banggai cardinal, lawnmower blenny, 6-line wrasse, and sailfin tang.