Hi guys brief outline went away for a weeks holiday left a friend to feed fish, came back and straight away realised something was a miss the fish were not swimming in there usual places i.e. the 2 clowns who always swim at the top back left were at the front and centre and the poor Mandarin looked like he had been dipped in Bleach. Did water checks oh what lovely colours we had levels all bagging , went to my usual lfs with water sample for second opinion not good did a 20% change followed by a 30% change 2 days later also running extra carbon now removed as per instructions ,then crossed everything but not hard enough lost Anathias day after and Clown fish both have w/s puffer also looks to have w/s rest ok so far . I am using the above Octozin in the hope of not killing my lobster ,boxer shrimp and crabs. Just wondering if anyone has used it ??? On a positive note clowns are still eating. Thanks Carol.