Skin/gill flukes

[Caliban07]

I'm almost certain there is a skin fluke parasite in my aquarium. One fish is at the latter stages while others are starting to show signs of rubbing on gravel etc.

I need to know what medication to apply to the whole aquarium and if any of these will not harm my snails or shrimp.

I don't have a quarantine tank at the moment.

Please help I need to go out and get something today.

I also live I the UK.

Thanks