so i have finally decided to try my hand at saltwater tank keeping. i bought a ten gallon kit from petsmart with hang on back filter. i also purchased a power head and Nicrew light from amazon with a glass hinged lid and a 50 watt heater. I purchased two life rock and caribsea live sand. I let the tank cycle for about 2 days and purchased a pair of clown fish (ocellaris). they seem healthy though i know they are fairly hardy. I also first filled up the tank with instant ocean water. yesterday i tried to add an anemone from the store. Yes i did it wrong i only temp acclimated than dropped it in. it was moving around for awhile and then found a place to stay i woke up this morning to it dead and i netted it out the aquarium which made a giant mess.. i did about a 40% water change but i used tap water with instant ocean salt. My salinity before water change was like 33ppm and now after my water change im at about 30 ppm. i just did water test and amoniam is zero . nitrite is zero. my ph is about 7.8-8.0. but my nitrate is between 5-10 ppm. not sure what i should do next. Do i buy some chemicals to reduce nitrate level? i only feed about once a day right now to keep levels low till its completely cycled. any advice would be helpful as i would rather not drain and start all over unless i have to.. i dont know if there are other equipment i should buy? i know 10 gallon is a bad idea because its so small but its what i have to use for the moment.