For retained shed, try a 30 minute soak in a lidded tub of tepid water and a gentle rub over with your fingers afterwards. Remember to check the eyes, chin and tail tip (retained shed can lead to tail tip loss if not spotted).

Checking shed skins can also be a good idea, make sure the eye caps are there and they're good for spotting sperm plugs in those 400g males that you think should be ready to go in a month or two!

Chris