Hammers do best with a moderate to low flow area in my tanks so I put mine towards the bottom of the tank. After saying that I have a frogspawn at the top of my tank under 150w mh
a near a power head but the power head is pointed down and away from the frogspawn. I usually don't leave my lps
on frag plugs the rock thing they come one. If you watch your coral you will see when it is happy and opens up if it stays closed try moving it to a lower or higher flow area and in different light.