Wordy post ahead but, I think you may want to take the time to read on ... if this solves the problem for anyone, it was worth the effort.
I have good news, which I will get to in a moment.
So the last post I contributed to this thread (you'll have to dig back to find it) had me convinced that by my client installing a $3000 HEPA filter on his HVAC that would filter the air (surmised to be mold perhaps?) and the slime would cease to exist. Well it worked for a couple weeks then, slime in the newly setup tank returned.
- Keep in mind that the tank has been setup with R.O.D.I zero TDS water immediately converted to marine. No decor, no lighting. Just glass covers, sump, skimmer and powerhead in tank - and slime.
One difference post HEPA filter is that the R.O.D.I barrel in the basement no longer slimmed up. Why?
It had no surface film whatsoever which was an anomaly.
So I drained and cleaned the tank again and filled it with chlorinated tap water this time. Unconditioned. In 2 weeks it was the standard slime-fest again. Freshwater!
Then a very unfortunate-fortunate event occurred. I visited a client that gets service twice weekly on a 15 year old system and out of the blue, they had the dreaded slime. Skimmer stunk like a bag of $#!% ... worse then it ever has. Tank smokey, corals in obvious distress. And *** is the smell in the office? ... Urethane?
So I speak to the office manager and the preceding weekend they had contractors SPRAY ALCOHOL BASED CLEAR COAT on their kitchen cabinetry. BINGO!
It was identical to the dental office that had been experiencing this gunk for 2 years.
So
(to solve the newest issue) I cleaned the skimmer, gave the tank a 10 gallon water change on a 200 gallon (5%) and added 2 lbs of activated carbon in the main flow area of the sump. I confirmed that there was to be no more spraying of solvents in the office (ARG!)
4 days latter the tank was much improved. Slime gone. Smell gone. 80% of coral recovered but some LPS looked receded. Over the next month all coral that appeared stressed after the fact receded to death. No stopping it even after moving some pieces to another system. Lost all brains, flavia and Blasto. Otherwise the tank has recovered. No dead fish, softs, mushrooms or anemones (3 bubbles).
So now I KNOW this is a case of carbon dosing that causes this 'slime syndrome', through some air or water borne source. So I press with the dental office again and while speaking to the Dr., he mentions that they always wipe down the chairs on the office after each patient but it was an organic wipe. I asked him to confirm the ingredients and low and behold, it contained 70% ISO-propal alcohol. Commercial grade cleaner wipes and not a consumer Lysol product. I should add that I never noticed any 'rubbing alcohol' odor in the office during ongoing weekly visits.
Forthcoming info after 2 years of fighting this cause on his behalf. Furthermore, the dental assistant tells me they switched brands of cleaner exactly 2 YEARS AGO!
Epilogue -
The wipes were removed from the equation and in 2 weeks the slimy tank self cleaned. Former slime was now but a white film that is easily wiped away. Just like any haze on the glass after a few days growth.
I have refilled the setup with R.O.D.I. (last week) and will report back if anything changes for the worse again. But I am convinced alcohol vapor was the demon in the room.
I surmise that the barrel stopped getting slime ahead of this discovery because any air exchanged in the basement would be going through the HEPA/ Carbon furnace filter and no longer expose the barrel to carbon dosing. Upstairs there are 4 examination rooms in the vicinity of the aquarium.
Not the brand of salt, not the source water or storage barrel. Not mold in the walls or ventilation. Not something being intentionally added to the tank or bad food, wrong chemicals. Nadda. Alcohol or similar carbon dose IS the problem.
Smile if this gives you an AHA! moment. I hope it does
Cheers