you got my attention.
I am very glad your fish is doing so well. But I think maybe you should do something about that piece sticking out of the water. you may try just raising the water level if you can. As far a Coraline goes, the stuff spreads rather quickly and pretty soon you will be using a credit card to scrape the crap off your glass. But seriously you may try adding calcium to the water to help with Coraline growth.
sorry, I have been extremely busy lately so I have not been on SWF.com in a while.