Back from the fish store (a MA in Iver... quite nice, WAY better than the MA near my house which in comparison is a tesco's fish section...). Couldn't find seachem prime, but I did find nutrafin aquaplus (which I got purely on the basis of it being more concentrated and cheaper than aquasafe; 10ml to 70L/35L (chorine/chloramine)). We'll see how it goes, for now only the crayfish was due for a water change, the fish will need to wait until next sunday to try it...
Michele
