55g Reef help

Hey Guys, I have few concerns for 55g reef. My tank is about a year old this month!, and I can say it looks pretty good. Heres a little background info, I have a hang off the back filter, for media : carbon,ammonia reducing pads, and normal filter pads. I don't have a protein skimmer ( stuck between the debate if its needed for not ). For lights I have a 4 bulb Florissant fixture ) With about 50lbs of rocks I have 1 head of frogspawn ( that is growing fast! ), A small branch of 3 heads of hammer coral, which is nearly dead, A large branch of 4 heads of hammer coral ( these were huge when purchased, after about 3 months in my tank they rarely open and when they do its very small ) 3 kenya trees, a devils hand and toadstool, I had a bubble coral and torch, but they died I guess. Cup coral, and Lastly, xenias ( which always open :) ) My concern is that at one point all of these corals thrived and were great, but now half don't open or get as big as they used too. Mainly its the hammer coral, but my frogspawn is doing great so I'm confused. I consider my self still new to this hobby ( I am 15 ), so most of chemisrty references go over my head, but Ive maintained a generally heathy reef for a year ( plus my 12g fluvial which is doing great :) ). The water parameters are NO3 40 / NO2 0.5 /PH 8.0 / KH 180 /GH 180, this was taken with test strips so not the most accurate. I just switched over to reef crystals for salt thinking that I was lacking essential nutrients. I dosed the tank with calcium, iodine , and Strontium and Molybdenum, back in December, when I ran out I never really picked it up again cause it was a " reef starter " and I think my tank is established. Thats the only real difference in my tank over time, my water temp is about 75, and powerhead is for a 75g tank, so its facing the glass, so flow is steady but not too much. My fish have always been healthy ( Yellow tang, 3 clowns, six line wrase, lawnmower blenny, sand sifting star, and a few hermits. Looking back at old pics the corals were looking great but now everything is kinda sad looking, and its been like this for a while. Any ideas or help? Heres a picture IMG_0032.JPG , IMG_0019.JPG , the pics don't do the lighting justice, but the hammer corals in the pic haven't opened in a month or 2.:confused::confused: