I just received a Hanna Phosphate Checker today, to check the Phosphate level in a container where I have been cycling some rock, that I would like to add to my established display tank. The levels in the container with rock are: Phosphate: 0.59 I also checked: Ammonia: 0.25 NItrate: 5.0 I am guessing that from this, I can not consider my rock being ready to add to my display tank. Is that correct assumed? Do all levels have to reach 0? Since I got the test kit today, I also tested the Phosphate level in my display tank. To my surprise the Phosphate level was 0.13. I had expected it to be much closer to 0, since I do constant auto water changes (20 litre pr. day) and use RO water and have not algeproblems. How bad is 0.13? I do not know if it is relevant, but I did today (a few hours previous to testing) I installed an auto feeder and made a mistake doing it. The result was that a quite big portion of food was dropped in the tank. I did however try to siphon most of it out. What would you do? How do I get the Phosphate levels down both places and also how bad are these readings?? Everything seems really good in my display tank and I was really surprised about having 0.13 in Phosphates. My fish and few soft corals, seem just fine. Do I need to start dosing something like e.g. Vodka or?