I purchased a bulb tip anemone on Saturday, it is doing fine, but my nitrates are higher than I would like, I was considering doing a water change tonight to get them down a little bit. All of the other levels are right where they should be. I did a 20% water change on Saturday, before placing the anemone in the tank. Is it too soon to conduct another water change, should I wait for the weekend. If it is not too soon, how much water is acceptable to change tonight given that the anemone was recently put in the tank on Saturday?