"Are you saying it's a crap trap Pat?"
Fred, that's exactly what I am saying. You put it so eloquently though.
There are several things I would do here that will make your experience far more enjoyable.
Before you get any more corals you need to get your Calcium, Alkalinity and Magnesium dosing under control. From your descriptions it is in dire straits. As well your PH needs to be accurately monitored. I use a Pinpoint Ph meter. I recommend the same.
#1. Get yourself some good test kits for Alkalinity, Calcium and magnesium. (PH also) I recommend Salifert, they are easy to use and accurate.
#2. Figure out how which way makes the most sense to dose. I use Randy's 2 part, #1 formula, because it has a tendency to raise ph and my ph has a tendency to run low. Besides it is an inexpensive way to treat your tank for these elements.
I use a commercial magnesium product because I am unable to find the "good stuff" Randy recommends for the magnesium. I use Bionic ESV to raise the magnesium. I do not recommend buffers. They are only a temporary fix. A 2 part system like ESV B-Ionic will work as well but you have to spend big bucks. Randy's is cheaper.
#3. I would spend some real quality time in the chemistry forum so you can learn how to dose you tank and keep the parameters straight. This is the point where most folks get lazy and end up having a tank full of diseased and disintegrating corals. This is very very important in the husbandry routine for a successful tank.
#4. I think the algae issue is because of flow. (overfeeding and no skimmer may contribute) You need to get the flow up. Seio's will work or lots of MJ1200.
#5. Do you have a skimmer? If not this is key to long term success. I would get one if you can.
#6 I am concerned that the substrate you chose may become a "crap trap" after time and create real nitrate problems for your corals. Especially if you don't have a good skimmer.
I will leave some links for you that are informative and will help. I can't stress enough the importance to get some flow and your calcium, mag and alk under control. Now is the critical time when you should be getting some good coralline algae to start growing. It will only grow with good water parameters.
Great start, you rock work looks real cool and you should be able to get some real interesting effects as you introduce the corals. But take my advice and get some things in line first before you proceed. I would hate to see one of those "oh no everything is dieing threads from you.
Thanks,
Pat
http://www.advancedaquarist.com/issues/feb2003/chem.htm
http://www.advancedaquarist.com/issues/august2003/chem.htm
http://www.reefkeeping.com/issues/2004-05/rhf/index.php
http://reefcentral.com/forums/showthread.php?s=&threadid=147010
http://reefkeeping.com/issues/2005-10/rhf/index.php