Red algae on rocks now bubble too

[bonniewoodruff]

I have been battling red algae on my rocks. I have been scraping and siphoning off. I do 10% water change every week and have a sump with bio balls,skimmer, and a refugium. I have tested the water and show 0 nitrates and 0 phosphates. I understand that the algae is consuming the nutrients and that is why they are at 0. Tank is a 90 gallon cube. I have a coral beauty angle, 2 clown fish, 3 damsels, a anemone. The clean up crew is hermit crabs, a few brittle starfish, a few serpent starfish, 2 emerald crabs, some Nassarius snails, 2 turbo snails and a tiger conch. I use ro water only.
I now have bubble algae on top of the red algae. I feed 1/2 frozen cube every other day. There is also alot of cyno on my sand bed now. Can I remove it ans add more live sand to it? I have read about dipping rocks in peroxide but not sure what to do.
I am not sure where the excess nutrients could be coming from.
Thanks in advance for your advice.

[Sniperhank]

All are signs of nutrient issues. Though you are testing at 0, all the algae and cyano are consuming the nutrients.
Feed less and sparingly, use ro/di water, so on.

[Bray84]

Would get rid off the bio balls their nitrate factory's


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[bonniewoodruff]

So I have had my lights off and the bubble algae is almost gone and the red is a lot less. Does any one know if it is ok to add sand to my sand bed. I am mixing water and I am going to have to remove some to get red algae out of the sand. I don't want to create any more issues than I have already. A also have a 65 gallon cube tank. Should I move the anemone to that tank? It is being hosted by the 2 clarki clownfish but is very small now that the lights are out.

[Sniperhank]

Seems you are moving about a mile a minute. The cyano will come right back when your lights are on. Still a nutrient issue to be addressed.
You can add sand to your sandbed, just make sure it is clean. Use a piece of PVC pipe to gently pour into your sand to avoid making a sandstorm and give yourself another issue.
In terms of your anemone, you should keep one in whichever tank has the lighting to support a creature that requires high intensity lighting. This is all aside form them needing pristine water, something that can take from 6 months to a year to develop and not have parameter swings in most tanks.