What is wrong with my tank and how can I fix it?

Could this be some type of green cyano?
I’m thinking your nitrates are too low. Did you get a chance to test?


Up with the nitrate (+3 ppm) if it is low and stir the sand every day. You
Do you have any theories on why this Cyano shows up when nitrate is low?
 
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Hey Guys, my tank is back with more algae issues. I keep getting this green mat all over everything. I’ve kept my lights low as well. Here is my phosphate and nitrates which both look high. What should I do??? Thanks @Aqua Man @Lasse
 
Here is my phosphate and nitrates which both look high. What should I do??? Thanks
Have you been stirring the sand every day or 2??
I would stir it up and do a small water change.

How are your coral looking? Is the Cyano only on the sand or is it on the rocks also?
 
It doesnt look like bryopsis I dont see any fern like algae in there. I just posted some other pictures….I think a tuxedo urchin might be the way to go, but my tank is only a 25 gallon so would that be too small?
I have a tuxedo urchin in my tank it’s a 13.5 and FWIW it’s always has something to graze on. You have a exceptional amount of algae, I’m sure you’ll be able to sustain a tuxedo.
 
Have you been stirring the sand every day or 2??
I would stir it up and do a small water change.

How are your coral looking? Is the Cyano only on the sand or is it on the rocks also?
Yeah I have been stirring up the sand, the mat of algae just comes back in a day or 2. The algae also builds up on some of the rocks on the sand as well. I only have GSP and some Zoas and they look fine. Some of the algae built up on my GPS though...
 
Yeah I have been stirring up the sand, the mat of algae just comes back in a day or 2. The algae also builds up on some of the rocks on the sand as well. I only have GSP and some Zoas and they look fine. Some of the algae built up on my GPS though...
Get a diamond goby he cleaned my sand bed very nicely
 
Well maybe how long my lights are on per day was my problem. I had them on for 11 hours and now I am reducing that to 8. Lets see what happens….
 
Hey guys, parameters are above for Phosphates and Nitrates. I am running my skimmer and used some Purigen to get rid of phosphates and everything is still high. I also have this mat of green algae that appears everyday on the substrate, rocks and on my GSP. Any idea on what else to do here?
 

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