I had a SLF. Named him louis, he had a TON of personality. If I put my finger up to the glass he'd zig-zag over and try to eat it. xD Sadly one day I found him colorless at the corner of the tank. I knew it wasn't a molt when he didn't come out to eat that day (he used to eat out of my hands). Loved that guy, he was a big part of my tank. Iw ont get another to replace him, it wont be as cool. lol
Never had a problem with fish, inverts, or coral though he loved to sit on my scoly and it didn't like that too much.