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I have a 5 month old 10 gallon nano reef tank.I'm having a slight problem with white,hard crusty spots forming in all areas of my tank.I have a cpl button polyp colonies,a mushroom coral,a peppermint shrimp,a col blue legged hermits,a clown fish,10 lbs of live rock live sand,low to moderate flow,and some led lighting,all my parameters are good and I do a 20%water change weekly and replace the filter cartridge weekly as well,I keep up on all the maintenance without fail.it is just a small problem at the moment but I tried scraping them off with a algae brush but they are just to hard to scrape off,any insite would be greatly appreciated!