i was feeding heavy then was told not to i was using everything in the book to try and raise my p04 levels neophos phytofeast reef roids turned off the skimmer took out chemipure elite nothing
If you make a bunch of changes all at once it is very difficult to isolate what is helping, hurting, or doing nothing at all.
Couple questions to try and help.
Did you try the trick to see if its dinos? It looks like cyano but it could be ostreopsis and large cell A...dinoflagellates combined. the first being targeted by UV and the latter pretty much only being removed by sanded removal or elegant corals regimen.
Does it float to the top of the water column right before lights go out? Is it easily blown off the rocks? How old is the sand in the system?
Are any corals being smothered? If not I wouldnt worry and just let the tank ride it out. There are a couple things that could wipe it out immediately but it would be a good time to figure out the cause of it.
How much flow do you have in the tank? What kind of lighting? How many hours? Any natural light hitting the tank? Does your skimmer appear to be pulling out dark skimmate consistently? How often to you check no3 and po4? Does it appear to get worse after a water change? Are you growing macro algae?
My recommendation would be as follows. Whenever possible I prefer natural ways to steer my system in the right direction. I would advise to just be patient and continue to suck it out and do water changes. I agree with your decision to be hesitant about using chemiclean even though it will work. I hate putting chemical in the display tank and avoid it at all costs. Especially ones that dont share their ingridients.
1) Suck as much of it out as you can with 1/4" line tubing to minimize amount of water being removed from the tank. Do not put that water through a sock just discard it.
2) Blow out your rocks really well with a turkey baster or small power head and try and keep it suspended until it gets surface skimmed by overflow.
3)gently stir the top layer of your sand bed in small sections at a time. Usually wherever unwanted blooms start (ie rocks, substrate) that is where the "nutrients" are for them to flourish. I highly doubt your system lacks phosphates but it is possible if you have been running media for a long time without monitoring nutrients. Something to keep in mind is rock and arogonite suck it up like a sponge and release it back into the water column when levels get low in the water column. That being said after you zero out po4 with media it will take a little while to get that bounceback effect and release more and that is where the problems arise.
4) maybe rearrange powerheads to try and minimize dead spots in the tank.
I would start there and be patient. If you keep doing this and it keeps coming back. I would recommend reseeding your tank with a diverse collection of copepods. I use 5280 pods from algae barn and I dose the tank with phytoplankton everyday after adding pods. If you use a tube and funnel and let them grab onto some detritus or macro algae in 3 days you will see them all over the glass in your DT. Keep flow off for 30 minutes. I put them in a passive low flow area in the sump but you can put them in the most optimal spot for your system. If it is in the display tank wait a couple hours after lights out and use tube or pvc.
Good luck and happy reefing.
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