I have a water box marine x 110.4 on the way and I want to keep an sps-dominant reef. I don’t know which power head to go with. Two mp40s sound good but I’m still undecided. Should I be looking for gyre flow or turbulent flow? Or both? Also can I put them on the back wall where they will be less visible or do they need to be on the side walls? I presume they need to be on the side walls but I figured it was worth asking. Thanks