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chaeto will lower the nitrate down like algae scrubber?Algae can grow in very phosphate limited water. Your best bet is to get a clean up crew and tang that help. Make sure you have good nutrient export (skimmer, chaeto etc...) and keep the water changes and carbon up.
Why chaeto is preferred over scrubber?If you have nuisance algae, you don't actually have that low of nutrients that the test is showing, it's just being taken up by the nuisance algaes before being registered by the test. Chaeto is a preferred algae for a refugium.
In a refugium not a scrubber. That said a scrubber will outperorm chaeto. I personally dont like chaeto because it grabs everything like filter floss. I really like caulerpaWhy chaeto is preferred over scrubber?
As far as I know, 0.1 ppm of phosphate and 10 ppm of nitrate will prevent phosphate.
but isn't phosphate levels can cause nuisance algae?
sorry I meant "will prevent Dino.."Sorry, but I do not understand what you are asking. Those levels are fine targets for a reef tank, but will also allow algae to grow.