Hi this is my first post ....I have a nice garden pond approx 1125 gals ...I have 7 mixed fish ...its about 8 foot long by 4 accoss and about 3.5 feet deep . i would like to add 2 more goldfish but i have read so much about them bringing deaseas to the pond is it really worth it ? I cannot quareenteen as dont have the facilities ..any advice would be helpfil ...i live in Surrey near Caterham !