I would highly recommend removing the horseshoe crab and the sand sifting star. They will both starve to death VERY quickly in a 29 gallon tank. Both those animals require huge, mature systems to survive as they deplete their food sources really quickly. And in a new tank, there probably isn't any food for them to begin with.
Thanks so much for the welcome and the info. I will catch the horshoe crab asap and take him back to the lfs. As for the SSStar, I have really grown fond of him and have read that I can target feed him when he is out at night to supplement the detritus in the sand. Is this advisable?
I had a couple other questions but had fallen asleep last night before posting them.
1. In the next to last picture That I posted, there is something back inside of that cavern that is moving. I only see it once a week or so, but its something I didn't buy and came in on the live rock. It's tan/brown, seems to be a couple inches long, and looks spine. It stays under that rock and I can only see him by using the light from my cell phone to shine under there (which also makes for a very hard pic to take as well). Any ideas? I thought it may be multi legged like a starfish, but it doesn't seem to be.
2. What are those two things that look like grey tripods in the last picture? They are tiny (smaller than 1/8") and move all over that one rock. Also came in with the lr I'm assuming.
3. What kind of coral do I have growing in the tank? I have three different types, and only one that I bought. I believe the white one that is spreading pretty rapidly is polyps? I didn't get a picture of that one ( forgot). The others I'm wondering about are the one in the third pic (came on the lr) and the fourth pic (purchased but forgot what they told me)
I'm currently giving my tank a third of a frozen block of food for the fish, purple up every other day for the healthy algea, and target feeding the coral oyster with a needless syringe once a week. I change about 15% of the water every two weeks, and I think that about it. I'm running purigen instead of carbon to help keep levels in check and all the water tests have been perfect so far. I've our purchased a protein skimmer but haven't put it on yet due to the cycling. I've also got a blower (for lack of a better term) in the tank to help move more water around on the opposite side of the return.
Any other suggestions/ ideas? Thanks a ton!