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Thank youWelcome to R2R! It is hard to be sure from the pictures but it looks like you have diatoms which are a very common occurrence as a tank is settling in (the typical 'ugly' stage). It should burn itself out fairly soon. If it gets worse you can try decreasing your lighting period or increasing water flow in the affected areas. Don't churn up the sand too much as diatoms use silica (like in the sand) as fuel.