Well I guess this is a seahorse tank?
I keep a pretty low flow rate, tank is 50 gallons and the only flow is provided by a 1/2" return line which is probably putting out 400-500GPH.
Lots of LPS and soft corals, no problems with the tentacles on the LPS and the seahorse is always touching them.
Lighting is 4 24Watt HO T5s, two 12K and 2 fiji purples I believe.
I used a larger crushed coral sand bed based purely on the acrylic tank to prevent scratches related to fine sand particles getting into the magnet.
Pretty close to 40-50 lbs of rock but it's mostly stacked completely vertical on the back
The tank is plumbed into a bigger system so it takes advantage of a very clean system. However I think this style of tank would do better with higher nutrients.