I've had a cleaner for a year now and he eats everything the other fish eat. He also drives my other fish nuts doing his job.I added an Angel sometime back that was loaded with ick(I didn't see it on him at the LFS) needless to say that Angel stayed close to the cleaner, within days there were no signs of ick.I wouldn't purchased a sixline because of their aggression. Advice: research the fish you want to purchase beforehand. Enjoy your tank!