Your canister filters are nitrate factories.
Open them up and remove any accumulated detritus. Rinse everything in the fitler with water drained in the tank. You'll aways have problems with canister filters, especially if you have high bio-load or feed a lot.
If while adding newly mixed salt your tank gets milky white it would indicate bionic imbalance. That can kill a lot of things spking your ammonia in the process which then kills more beneficial stuff.
Which saltmix are you using and what are you using to test salinity of the water?
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BAS - Educating Aquarists Since 1911.
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