So we are moving into a larger apartment since our family is expanding. Since i currently have a 55g turtle tank, 30g saltwater tank and 15g planted tank I am looking at down sizing the amount of tanks I have and just getting one large saltwater setup. I will be on the first floor so weight isn't as big an issue vs an upstairs apartment. What would be a good size tank to do a reef in that I won't be so limited to my selection of fish? I will be taking my clowns, banded coral shrimp, diamondback goby and transferring them into the new tank and would like to add some tangs or butterflyfish. What size should I be looking for?