Hi Dennis. First off Welcome to Reef2Reef. We are a great group of people with a wealth of knowledge, willing to share and assist new and existing reefers along their hobby journey.
With that said I have some comments. Please take these as constructive as I am just trying to help...
1. After a good cycle, you should be at zero ammonia. If you have a detectable amount, you are either not done with the cycle or you have added too much, too fast. Plus adding the new rock that is coming in may cause another cycle and spike the ammonia up high.
2. Your tank is WAY too small for a tang. These fish may be OK in there for a very short time, but you will see major aggression and health issues as the tang grows. I would suggest bringing him back to the store to trade for something smaller. Or better yet, trade for store credit so you can wait for your tank to finish cycling before adding more to it.
3. take everything the LFS says with a grain of salt. Verify this information with reputable sources on the internet like Reef2Reef. Do not make spur of the moment decisions as they can cause you issues in the long run.
4. Remember the golden rule in this hobby is "nothing good happens fast". Slow down and make sure you have completed the milestones of each step in setting up this tank. You will be happier in the long run as you will not lose as much livestock.
5. If you are going to go with a sump, I would recommend draining and drilling the tank if possible. You will be much happier with a drilled tank than a HOB overflow. They are just much more reliable and can take up much less room in the tank.
Also it looks like your tank is low on water. With a smaller tank, it is much easier to get the salinity messed up through evaporation. Be sure to top it off with fresh RODI water (not tap) which will maintain correct salinity. Once you have a sump it will be easier to add in an automatic top off system so you don't need to do this manually...
Again, welcome to Reef2Reef. We look forward to more pictures!
