I'm currently setting up a 45 gallon corner stand reef. Got the live sand and salt, my question is what size powerheads do I need, should I use two or three with it being a taller tank? If I remember correctly u need 20-30x the gph of the size of your tank. I had a reef tank about 20 years ago, so I'm basically a beginner at this again. And do I need a hang on filter, or just a protein skimmer, since I will using some where around 50-60 lbs of live rock. Thanks in advance for any advice.