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Hi new to fish keeping. Have set up 40 ltr tank with red eye tetras and tiger barb and nerite snails. Just got water levels correct for nitrite and ammonia and nitrates after initial set up 6 weeks ago. Have just noticed a white substance on the tank side. Had smaller one before but it disappeared over night. The photo shows how it looks. We cant remove it. Does anyone know what it could be! Thanks
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