OK, for what you have in there, I would just let the alk and ca drop naturally for a while. NSW calcium is around 400, and I am a big proponent of trying, and I emphasize trying, to keep my levels around NSW. The soft corals you have do not require the calcium, but it is awful good practice for when you get into the stony corals. I haven't used a 2 part in a long time, so I am not to much help here on that. Hopefully someone else who has had some will chip in and give us a hand. If I find the need to boost the Ph, I just use regular old washing soda, about a teaspoon per a quart of water.