If they don't put on some weight and don't show any signs of disease I may cut quarantine short. From what I have read they are very unlikely to have Ich because of their thick slime coat. Can anyone elaborate on that ? Risk vs. reward.
Captive bred fish that have never been kept with other fish have little chance of infection. Check with your supplier. If they were not in a fish system with other fish, you risk level is very low . If your supplier kept them in a fish system that shares water between tanks, risk of ich is low but risk of other parasite is high