Darth avoided the whole commotion about fungi and Ick.  Darth and the heavily Ick infested clown loaches was a situation just waiting to go bad.  They were all in the little cave decoration.  After two days of over-medication 1.5X recommended amounts, I had to get rid of the loaches as it seems they were too far gone to recover.  Through the whole ordeal, the worse for Darth was a bad case of pleco diarrhea.  In fact, you can actually see the healthy strain of waste (about a foot long in this case).