thanks for the replys i have a 14 litre tank and a mini underwater filter which works brillantly, it was a tank in which mates brought for me on my birthday, quite a surprise pressie really, i asked the pet store which deals with just fish if blackmoors would be ok for this type of tank and they said it would be fine, the fish is slowly getting worse its now hard to tell if it is breathing at all, i know this sounds awful but is fish does die will it flow to top. i really hope it does live as they are such a lovely breed. thank you