Thank you for your reply.
I, unfortunately, don't know what kind of live rock I have since the aquarium was given to my by a friend who had it for 5 years. But I know he was successful in raising corals.
I feed typically a flake food from a company called Aquadine. My lfs
has a station with about 8 different types of these flakes and I tell him what kind of fish I have and he mixes up some for me. I went to their website and they didn't have any information on what is in their product.
I've actually thought of making a concentrate with the fishfood to try and measure how much phosphate is in there using my testkit, but I haven't done this yet.
I don't see how I could be feeding too much since I only have two fish (a Yellow Tang and a Spotted Hawkfish)... I try to feed once every other day or every third day. (Unfortunately or fortunately, I have plenty of hair algae for my Tang to eat.) I am guessing that I put in about 10 flakes when I feed, but I am really not sure. I just purchased some frozen mysis (sp) shrimp thinking that it would be good to have some variety and that this might have less phosphate in it. Can you advise me on a better feeding schedule and food type?
I noticed in a reply to one of my earlier posts that Timbo2 had a very similar problem with phosphate levels increasing.
I will attempt some larger water changes, but it seems like I should wait until the phosphate levels are high again to do this.?
Thanks again for the help!