Okay so it day 50 and my levels are 0.Ammonia 0,Nitrite 0 and Nitrate 0.I am going to wait one week and check the levels again and then I want to introduce Corolline algae using rock that has it on it.Question one: should I have no Trates?I introduced Ammonium chloride on day 6 and I have been testing every day and I added more ammonia yesterday.Yesterday tests said I had 0 ammonia and trates and .25 ppm of trites. Question two: If I test next week and still have 0 levels across the board is it a good time to introduce Corolline algae?Question three: Should I do a one hhundred percent water change before introducing the corroline algae?Any advice would be appreciated!