I've had a cleaner wrasse for about 6 months now and he is growing and eating readily. He eats brine, flake, and frozen.
As to Cleaner wrasses eating ich....they simply don't. As Steven Pro states in his article on Crptocaryon Irritans "One last note on Labroides wrasses, contrary to popular opinion, they do not consume Cryptocaryon parasites. They have demonstrated a strong preference for gnathid isopods, which make up between 77 and 85% of their natural diet (Grutter, 1997 & 2000). The remaining prey items are composed of scales, parasitic copepods, and non-parasitic copepods. So, regardless of whatever conscientious objections one may or may not have regarding their availability in the marine aquarium trade, they are not going to help in the battle against Ich. Also, since Cryptocaryon irritans is known to be rare in the wild (Bunkley-Williams & Williams, 1994), it would follow that it is unlikely that Ich makes up any significant portion of any cleaner organism's diet. This, coupled with how deep the trophonts embed, throws into question the effectiveness of any cleaner against Cryptocaryon irritans."
So if you are looking to control ich, go with cleaner shrimp. If you are just wondering if you could keep a cleaner wrasse, I'd say go with a neon goby instead. The only reason I have mine, is because we got an extra in at work and I didn't want to send it back to the distributor. I would much rather see these fish kept in the wild.
- Matt