new tanks go through their "algae cycles". I wouldn't worry too much at only a month. Like michika said keep on top of your routine. Make sure you siphon out the detritus as often as possible (every week, minimum). Fairy hermits are awesome for hair algae too.
I find often hair algae problems are caused by detritus problems. Detritus that isn't dealt with ever ends up leeching into the rocks which then takes forever to leech out. If you take care of detritus on the bottom of the tank (and the stuff lieing on the rocks) early then you solve the problem before it starts.
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Everything I put in my tank is fully dependant on me.
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