The tortoiseshell one is called Rincewind (cos he's the smallest wimpy one), the silver one with two orange spots on its head is called Twoflower (he's also the most enthusiastic!), and the gold one is called Cohen (the Barbarian) ... and I'll give a virtual 10p to the first person who knows where those names come from!!
Thanks for all your advice and help guys, I'll keep you posted with their progress!!
By the way, an update on the sucky-twins, Castor hides all the time in the urn, and Pollux spends most of his time behind the urn, I only ever seem to catch glimpses of them, maybe they only come out at night when I'm asleep!! :?
And my new fishy chums seem to be living up to their names, Rincewind hides all the time (complete coward!!), Twoflower is just SO hyperactive about everything and Cohen is just really cool, laid back except when there's treasure (food!!) around and then he gets all excited!!