thanks for your replys. JamieB, You could be right. In answer to Mmathis Q, I am not sure!!!. I am referring to "koiphen.com", which was suggested by a member. There is nothing wrong with that. To do with health of one of my fish. I tried to register, one of the Q,s was do i know any members of their forum. No i do not. Quite why they wood ask that Q, is beyond me!! Maybe to do with sponsoring!!!. What i do know, is i am not pursuing that line of enquiry again!!!. I will stick with Garden pond forums, of which i am very happy with, Members,replys, + information etc,etc. P.S. Untill anyone answers that section you cannot go any further with the registration!!. This new pond i have yet to assemble is 336litres, 74 Gallons. Apart from measuring every fish, is their a simple way to guage how many fish i can put in pond. My other is 480litres, 105 gallons has 9 differnt sizes of goldfish. thankyou, Blue.