About a year or two ago, we had a 20 gallon tank set up outside with just f/w. All it grew was algae and mosquito larvae, and one day my younger brother took ammonia, bleach, detergent, and other chemicals and dumped them in the tank. It stayed that way for aut a weekuntil we dumped it out. i would like to use a 20 gallon for an upgrade from my 10g nano reef, can i use this tank? Its been washed out and sitting in the garage for about a year and a half, ad has no chemical smell or anything. What do you think? BTW, there was nothing in the tank except water and mosquitos.