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The tank is 2 years old. It it is recovering from an ultra low nutrient problem, hat tip to Diesel.How new are these tanks? We are looking at two tanks right? Are they connected together on the same system? The red looks like cyano and is usually helped by more flow in that area. If the tanks are new then I would just add more flow in that area and wait it out for now. If it continues then I would start investigating other problem areas that would cause this.
Thanks for the concern. Diesel confirmed it was cyno which is a bacteria so you fight it different than algae.I'm not great with algae problems and since @Diesel has been helping you and knows what all has been going on here, I'll tag him in and see what he says. Sorry to not be much help.
In the DT, Nutrients and probably lighting. I have 2 newish T5s and 4 about 9 months old. I'm replacing one ever 2 to 3 weeks. I've also just backed off of a heavy feeding period. The ULNS.Cyano benefits from mainly Lighting, nutrients (excess nitrates and Phos), and flow. Looking closely at these will give you a good head start to finding the root of the problem. Lighting maybe inadequate or bulbs may be out of date, flow may not be enough.
You may want to look into dosing a carbon source, like vodka or vinegar. Use caution however, and research these option very well. If not dosed correctly you could create a real headache. I dose vdk myself and couldn't be happier with the results.
That was a great move. I learned so much. Met some great people.That will work too, but he came from a super low ULNS a few weeks back as he was running Phosgard, bio-pellets and Chaeto in the sump.
As results his corals got starved up to severe stress that some didn't make it.
We backed off all above and relied just on the skimmer and WC, still we didn't see any improvement on N03 and Po4 #.
So we started to feed the fish more and spot feed the corals, that did work and corals started to get color back.
Now we just have to find the fine line between the feedings that Cyano won't have a chance.
This is his sons tank as his son left for college but will be back with the holidays and I promised him to help him out even the process can be stressful but I'm sure we will get there in time.
If not Diesel just have to pull-out the big guns and re-scape and re-load with some great corals from my frag tanks.
This is a great family as they always a helping hand in the Houston Marine/Reef Community, last time I saw them together we were moving out a
740 gallon tank and moving in a 380 gallon in 100F Houston everyday summer weather.
All I can do at least is get their 90 gallon back on track and looking great for the Holidays.

