HELP Clear mucus taking over tank

Reef_Collector28

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Hi guys, need someone’s help badly. So in the years of reefing and keeping multiple reef tanks I’ve never dealt with this before. I have a whiteish clear mucus like stuff all over my tank. Have not been able to get rid of it in months. Keeps on coming back. It has covered all my rock work and makes a thick film over glass and over flow. Comes off in light brown sheets when I scrape off. I highly doubt it’s algae, I might be wrong.

Been getting my tank serviced and my service guy has been doing 45 gallon water changes with RO water and Fritz Pro salt (blue box) once a month. Sometimes 2 a month. My tank is a Red Sea, total volume roughly 110 gallons.

Have 2 radions, big octopus skimmer, pulls out a lot of gunk. Run a filter sock which gets clogged easily because the mucus like stuff, filter sock is super slimy. All parameters are on point, he checks them with Hanna checkers and salifert test kits. Nothing seems to be off.

Weirdest part is most of my corals are bleached and have been for about a year without any change. Ricordea, Sea fans, couple of montis, seem to be unaffected. LPS like Acans, chalices, wilsoni and my Acros are the ones who don’t get any better. I have small amount of fish in the system, feed twice a week, small amount.
 
Did you have any pic of the white mucus?
 
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I've never seen this stuff before either. Bacteria sounds reasonable but what is fueling it? What powerheads do you have? Is it possible the flow rate is too low? Lights too high (bleaching and dying coral)? Maybe it is time to look at the things you think are ok like is the RO water really low TDS (old/broken membrane), are the test kits really reading correctly? Are contaminants entering the tank such as hand/body lotions/cleaners/air fresheners/smoke? The different needs of the coral doing poorly versus the ones doing well seem like a good clue to follow
 

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