suggestions for ideal flow SPS tank?

[Kyton66]

Hi,
Hope you can help me out with your suggestions for sump return lines and total water flow for a SPS tank. The tank will be about 150 gallons (48x24x30) or a bit larger. Still in the planning stage, but hey that’s the fun part

This tank will be in a wall, so was hoping to hide the use of powerheads within the tank. Thought of using loc-line with tips just below the surface to get flow on the front of the corals as well. Since the loc-line tips are just below the surface, a reverse siphon will only happen for about the top ½” of water when the power is turned off. Also in this set up planning on two vortech powerheads hidden in the rockwork at opposite ends of the tank, facing towards the centre.

I’m a bit concerned about the dreaded flood so thought of keeping all holes in the tank up high. Then if a power failure happens, and the union check valves fail - yikes! – half of the tank’s water won’t drain on the floor. Hey I’m good for suggestions on this one. :-)

Check out attached sketch
A- Additional External water pump with pick up from screened off intake area behind rock work. Thought of having one return line from sump exit into this caged area. Then this “clean” water will also be pumped through the tank using surface loc-line

B- Two Vortech pumps for flow hidden in rockwork.

C- Drain lines to sump

D- Return lines from sump

Cheers, and thanks