hi please could anyone help me and my goldfish , they have been unwell for a week now i have been to my local pets at home and had the water tested , and the water isnt bad , my fish are in a corner at the bottom af the tank and there fins are clamped and they have started to try and sctrach them selves on the stones i think it sounds like chilodonella??? i have treated water with aquriam salts , stress zyme + and stress coat which were recomended to me from pets at home , is there anything else i can use , or should i change the water and if so how often ?? please can anyone help me , thanks in advance jo