Correct me if I am wrong but I think mixing 6 oz. fixer with 30 oz. of water is a ratio of 1 to 5 not 1 to 4. A 1 to 4 ratio would be 6 oz. fixer with 24 oz. of water. Maybe your fixer is not strong enough. The Ilford fixer bottle says 500ml of fixer will make 2.5 liters of working solution at a ratio of 1 to 4 (500ml to 2000ml= 2.5 liters). That is the way I mix it.
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