Low nutrient levels in tanks with nuisance algae!

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My young 4mo tank has a pretty good coating of fuzzy brownish algae, (likely diatoms) on the rockwork. I've been overfeeding and even adding nutrients due to consistent readings of 0.0 nitrates and phosphates. How do I know if my tank really needs added nutrients to create measurable levels, or if I'm making things worse by essentially feeding the algae?
 
you’re feeding the algae. you gotta pull the algae out while lowering your whit(edit: and red) lights and increasing your CUC. continue feeding normally (no need to overfeed)

what are you testing the water with?
 
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Lightly scrub the rocks with a soft toothbrush and siphon out as much as possible. What else do you have that could compete with the algae? It'll probably come back unless you have something exporting those nutrients; corals, filtration, etc. Got good flow so uneaten food doesn't stick around rotting?
 
you’re feeding the algae. you gotta pull the algae out while lowering your whit(edit: and red) lights and increasing your CUC. continue feeding normally (no need to overfeed)

what are you testing the water with?
Hanna
 
Lightly scrub the rocks with a soft toothbrush and siphon out as much as possible. What else do you have that could compete with the algae? It'll probably come back unless you have something exporting those nutrients; corals, filtration, etc. Got good flow so uneaten food doesn't stick around rotting?
Flow is excellent with two MP 40's. Filter socks changed daily as they clog up with what appears to be uneaten food, Octo skimmer, UV and a well established pod population. Feed 30 mls phyto daily for pods. I don't have coral as my plan has been to wait until tank is mature and initial algae issues are resolved before adding any, (20 years ago I was driven out of reefing by algae overgrowing my corals). I would "like" to start a fuge to compete with the nuisance algae but have been told I need nitrates and at least .03 phosphates in my water before macroalgae will survive. Is it possible a fuge could provide the competition for algae you suggested I need? CUC consists of snails, mostly Cerith and Nassarius which were rarely on rockwork. I just added two LARGE Tiger Turbo's,(seem helpful), which had been in my old tank for 3+ years and a dozen Trochus,(<1/2") which seem lost in my 100 lbs of rock. I feel I may need some more substantial snails but am concerned about dead Mexican turbos fouling my water.
 
The nutrients are low because the algae is consuming it. Algae blooms are normal for a tank that age. Especially if you’re fueling it by adding phyto. You have good filtration and the addition of those turbos will help but I would get some more trochus with that much rock.

Keep on your maintenance and stay the course and you will prevail.
 
Betcha those big snails you got do work. I got through the uglies with the help of 2 larger snails a buddy gave me. They literally chewed through hair algae. This rock was absolutely covered in long flowy gha. Took the big snails 2 nights to clean it. Ceriths moved in after and cleaned the rest. It's clean to this day but that's because I started adding corals to outcompete the algae...otherwise it'd come right back right? Gotta tip the scales somehow...
algae_rock.png
 
My young 4mo tank has a pretty good coating of fuzzy brownish algae, (likely diatoms) on the rockwork. I've been overfeeding and even adding nutrients due to consistent readings of 0.0 nitrates and phosphates. How do I know if my tank really needs added nutrients to create measurable levels, or if I'm making things worse by essentially feeding the algae?
Pics?
 
The nutrients are low because the algae is consuming it. Algae blooms are normal for a tank that age. Especially if you’re fueling it by adding phyto. You have good filtration and the addition of those turbos will help but I would get some more trochus with that much rock.

Keep on your maintenance and stay the course and you will prevail.
At this point is feeding phyto counterproductive? I've really been focused on establishing pods. Based on what I've read Trochus snails seem to be the best but I'm having trouble finding them and those I do find are small.
 
I was focused on pods too at one point as I really wanted a Mandarin. I dosed phyto but I was not regimented about it. So what I did notice is on the nights I dosed phyto, algae grew faster/more the next day... I have since stopped with the phyto and the pods are just everywhere. At some point it may be needed but maybe not right now?
 
In my own tank I found trochus are good at filamentous stuff while ceriths and big turbos will eat all the way up to hair. The trochus tho didn't last for me for some reason (one left). The ceriths and turbos are all going strong...
 
From what I understand the red and green spectrums can promote unwanted algae growth. The white spectrum is just all the spectrums combined, including red and green which as a result can promote that unwanted growth.
 
OP,
Pull out what you can with your fingers. Pull, dip in a container of tap water and release. Repeat. The only way I would brush the rocks with them in the tank is if it was taped to a hose so you're siphoning at the same time. Otherwise you're going to just spread it all over. Algae promoting lights are basically white, red, and green, and blue. Algae can use those spectrums to grow on. White has all the spectrums.

If there's nothing in your tank as far as corals can they be pulled out and maybe brushed outside of the tank? Then they can be dipped in clean tank water and put back in the tank. Or you could use hydrogen peroxide on the algae spots.
 
If you can pull it off good luck to ya. I brushed it with all pumps off and siphoned as much out as I could. Leave filter media (socks etc) in place for a few hours after with pumps on to catch free floating. Rinse and repeat....
 
OP,
Pull out what you can with your fingers. Pull, dip in a container of tap water and release. Repeat. The only way I would brush the rocks with them in the tank is if it was taped to a hose so you're siphoning at the same time. Otherwise you're going to just spread it all over. Algae promoting lights are basically white, red, and green, and blue. Algae can use those spectrums to grow on. White has all the spectrums.

If there's nothing in your tank as far as corals can they be pulled out and maybe brushed outside of the tank? Then they can be dipped in clean tank water and put back in the tank. Or you could use hydrogen peroxide on the algae spots.
Some rock could be pulled but most is cemented together in large sections. It would be difficult to "pull out" the algae bc it's really just a thin covering. I've scaled back lighting from 50 to 20% and white and red are off.
 
Betcha those big snails you got do work. I got through the uglies with the help of 2 larger snails a buddy gave me. They literally chewed through hair algae. This rock was absolutely covered in long flowy gha. Took the big snails 2 nights to clean it. Ceriths moved in after and cleaned the rest. It's clean to this day but that's because I started adding corals to outcompete the algae...otherwise it'd come right back right? Gotta tip the scales somehow...
algae_rock.png
What are the chances of establishing competing macro in an attached fuge at this point?
 
What are the chances of establishing competing macro in an attached fuge at this point?
Yes. Why not if you have the space for it. The macro (like chaeto) may stay idle until the algae is removed because right now it's winning the nutrient race. Even if you setup a refugium and were just able to grow the algae in there you'd have less (once removed) in the DT.
 
Yes. Why not if you have the space for it. The macro (like chaeto) may stay idle until the algae is removed because right now it's winning the nutrient race. Even if you setup a refugium and were just able to grow the algae in there you'd have less (once removed) in the DT.
I do have a fuge section in my sump but I've been told I can't get it going until I test measurable nutrients in the water column. My desire has been to get one going as early as possible as competition for algae growing in the display.
 

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