Brown film

I don't want to even talk about what I get after a water change lol. I get the worst brown hair cyano outburst on the glass and pumps after a 5 gallon water change. I went to doing a 5 gallon change once a month and looking into stretching it out to more just to avoid that outbreak and dosing trace elements. I think my reef crystals is a bad batch, might switch to the regular instant ocean or seachem salt.