Warning: if gruesome tank photos ruin your appetite, don't look
I got another seahare this past Saturday - cute little green monster. He's earned his keep already by eating sheets of cyano off the back glass. I've sure never heard of them doing this:
How did I let it get this bad, you ask? Truth is, I'm waiting to siphon out the worst of this junk til I get my new RO system, because it's going to require a major water replacement. He started around the base of the Koralia...
You can see how he has cleared an entire space. Good seahare!!
(Of course it looks better now - I got in there Sunday night with scraper and net to catch the worst of it)