Red slime killing acros

AaronFReef

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I had a series of unfortunate events strike my 25g lagoon a few weeks back where my dozing containers ran empty causing alk to drop from 8.6->6.9, my lights to stick on overnight, my flow had changed from me swapping powerheads and was much less movement (bad experiment in pulse flow), and phosphates hit zero. It was an unbelievable series of system failures and mistakes. Most of my coral survived well but some acros didn’t look so hot a couple days later. Some began to develop a red to brown slime on the tips which I looked at under a microscope fearing a return of dinos which I had last year. They appeared to mostly be ciliates. The slime was nearly impossible to remove. I could just barely blast it off with a big Kent squirt feeding syringe. I tried dipping the worst corals in lugols and revive but neither seemed to help much. Now it’s spreading throughout the tank even though the system is very stable again. Even coral that we’re doing phenomenally through this all are now getting the red slime on tips. Is there anything I can do to halt the slow progression that is taking weeks to slowly kill of acros from the tips to the middle?
 
Pics of the damage

the coral with the most active

3F484083-0925-4BE2-B8C9-B7FA9BFC6287.jpeg

the Walt Disney. It’s starting to show some slime on three small tips you can see here.

1FFBB0E0-71C6-4CBD-AF58-D89299BDB132.jpeg


The remnants of my second largest colony fragged to bits and attempting to glue back into a colony. It’s nearly gone but still has red brown slime.
62AC3C13-675E-4234-AABA-6466E9FB76A6.jpeg
 
Sorry yes I should have said parameters. Alk is stable at 8. Ca 430. Mg 1335. NO3 has been stable between 5-10. PO4 at 0.05-0.10 usually around the middle. I feed for coral to raise it with reef roids, aminos, phyto, and change filter sock or run a small trickle through carbon and gfo in a canister to lower it.

Ever since the PO4 tanked to 0.02 from adding too much GFO during a canister change when this all started, it’s been back to the stability I had before.
 

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