[TurboRook]

When it comes to an SPS dominated tank, it is hard to have too much total flow. There are two limiting factors, though:

1) Sandstorms - sugar-fine sand becomes a real limiting factor in SPS tanks, especially as they mature and grow out. There is only so much flow you can get before you create a permanent sandstorm. This can be especially problematic in tanks with multiple colonies in the lower half of the water column and when you need to increase flow to prevent lower branch recession.

2) Velocity - the nozzle velocity of powerheads and plumbing outlets can also be a llimiting factor. As has been said before, high velocities can literally tear tissue right off a branch. To reduce this, use larger plumbing fittings for the outlets, eductors, and high-flow powerheads such as Streams and Seios.